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/* Matsushita 10300 specific support for 32-bit ELF Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. This file is part of BFD, the Binary File Descriptor library. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ #include "sysdep.h" #include "bfd.h" #include "libbfd.h" #include "elf-bfd.h" #include "elf/mn10300.h" #include "libiberty.h" /* The mn10300 linker needs to keep track of the number of relocs that it decides to copy in check_relocs for each symbol. This is so that it can discard PC relative relocs if it doesn't need them when linking with -Bsymbolic. We store the information in a field extending the regular ELF linker hash table. */ struct elf32_mn10300_link_hash_entry { /* The basic elf link hash table entry. */ struct elf_link_hash_entry root; /* For function symbols, the number of times this function is called directly (ie by name). */ unsigned int direct_calls; /* For function symbols, the size of this function's stack (if <= 255 bytes). We stuff this into "call" instructions to this target when it's valid and profitable to do so. This does not include stack allocated by movm! */ unsigned char stack_size; /* For function symbols, arguments (if any) for movm instruction in the prologue. We stuff this value into "call" instructions to the target when it's valid and profitable to do so. */ unsigned char movm_args; /* For function symbols, the amount of stack space that would be allocated by the movm instruction. This is redundant with movm_args, but we add it to the hash table to avoid computing it over and over. */ unsigned char movm_stack_size; /* When set, convert all "call" instructions to this target into "calls" instructions. */ #define MN10300_CONVERT_CALL_TO_CALLS 0x1 /* Used to mark functions which have had redundant parts of their prologue deleted. */ #define MN10300_DELETED_PROLOGUE_BYTES 0x2 unsigned char flags; /* Calculated value. */ bfd_vma value; }; /* We derive a hash table from the main elf linker hash table so we can store state variables and a secondary hash table without resorting to global variables. */ struct elf32_mn10300_link_hash_table { /* The main hash table. */ struct elf_link_hash_table root; /* A hash table for static functions. We could derive a new hash table instead of using the full elf32_mn10300_link_hash_table if we wanted to save some memory. */ struct elf32_mn10300_link_hash_table *static_hash_table; /* Random linker state flags. */ #define MN10300_HASH_ENTRIES_INITIALIZED 0x1 char flags; }; #ifndef streq #define streq(a, b) (strcmp ((a),(b)) == 0) #endif /* For MN10300 linker hash table. */ /* Get the MN10300 ELF linker hash table from a link_info structure. */ #define elf32_mn10300_hash_table(p) \ (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ == MN10300_ELF_DATA ? ((struct elf32_mn10300_link_hash_table *) ((p)->hash)) : NULL) #define elf32_mn10300_link_hash_traverse(table, func, info) \ (elf_link_hash_traverse \ (&(table)->root, \ (bfd_boolean (*) (struct elf_link_hash_entry *, void *)) (func), \ (info))) static reloc_howto_type elf_mn10300_howto_table[] = { /* Dummy relocation. Does nothing. */ HOWTO (R_MN10300_NONE, 0, 2, 16, FALSE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_MN10300_NONE", FALSE, 0, 0, FALSE), /* Standard 32 bit reloc. */ HOWTO (R_MN10300_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_MN10300_32", FALSE, 0xffffffff, 0xffffffff, FALSE), /* Standard 16 bit reloc. */ HOWTO (R_MN10300_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_MN10300_16", FALSE, 0xffff, 0xffff, FALSE), /* Standard 8 bit reloc. */ HOWTO (R_MN10300_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_MN10300_8", FALSE, 0xff, 0xff, FALSE), /* Standard 32bit pc-relative reloc. */ HOWTO (R_MN10300_PCREL32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_MN10300_PCREL32", FALSE, 0xffffffff, 0xffffffff, TRUE), /* Standard 16bit pc-relative reloc. */ HOWTO (R_MN10300_PCREL16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_MN10300_PCREL16", FALSE, 0xffff, 0xffff, TRUE), /* Standard 8 pc-relative reloc. */ HOWTO (R_MN10300_PCREL8, 0, 0, 8, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_MN10300_PCREL8", FALSE, 0xff, 0xff, TRUE), /* GNU extension to record C++ vtable hierarchy. */ HOWTO (R_MN10300_GNU_VTINHERIT, /* type */ 0, /* rightshift */ 0, /* size (0 = byte, 1 = short, 2 = long) */ 0, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ NULL, /* special_function */ "R_MN10300_GNU_VTINHERIT", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ FALSE), /* pcrel_offset */ /* GNU extension to record C++ vtable member usage */ HOWTO (R_MN10300_GNU_VTENTRY, /* type */ 0, /* rightshift */ 0, /* size (0 = byte, 1 = short, 2 = long) */ 0, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ NULL, /* special_function */ "R_MN10300_GNU_VTENTRY", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ FALSE), /* pcrel_offset */ /* Standard 24 bit reloc. */ HOWTO (R_MN10300_24, 0, 2, 24, FALSE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_MN10300_24", FALSE, 0xffffff, 0xffffff, FALSE), HOWTO (R_MN10300_GOTPC32, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ TRUE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* */ "R_MN10300_GOTPC32", /* name */ FALSE, /* partial_inplace */ 0xffffffff, /* src_mask */ 0xffffffff, /* dst_mask */ TRUE), /* pcrel_offset */ HOWTO (R_MN10300_GOTPC16, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ TRUE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* */ "R_MN10300_GOTPC16", /* name */ FALSE, /* partial_inplace */ 0xffff, /* src_mask */ 0xffff, /* dst_mask */ TRUE), /* pcrel_offset */ HOWTO (R_MN10300_GOTOFF32, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* */ "R_MN10300_GOTOFF32", /* name */ FALSE, /* partial_inplace */ 0xffffffff, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ HOWTO (R_MN10300_GOTOFF24, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 24, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* */ "R_MN10300_GOTOFF24", /* name */ FALSE, /* partial_inplace */ 0xffffff, /* src_mask */ 0xffffff, /* dst_mask */ FALSE), /* pcrel_offset */ HOWTO (R_MN10300_GOTOFF16, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* */ "R_MN10300_GOTOFF16", /* name */ FALSE, /* partial_inplace */ 0xffff, /* src_mask */ 0xffff, /* dst_mask */ FALSE), /* pcrel_offset */ HOWTO (R_MN10300_PLT32, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ TRUE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* */ "R_MN10300_PLT32", /* name */ FALSE, /* partial_inplace */ 0xffffffff, /* src_mask */ 0xffffffff, /* dst_mask */ TRUE), /* pcrel_offset */ HOWTO (R_MN10300_PLT16, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ TRUE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* */ "R_MN10300_PLT16", /* name */ FALSE, /* partial_inplace */ 0xffff, /* src_mask */ 0xffff, /* dst_mask */ TRUE), /* pcrel_offset */ HOWTO (R_MN10300_GOT32, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* */ "R_MN10300_GOT32", /* name */ FALSE, /* partial_inplace */ 0xffffffff, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ HOWTO (R_MN10300_GOT24, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 24, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* */ "R_MN10300_GOT24", /* name */ FALSE, /* partial_inplace */ 0xffffffff, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ HOWTO (R_MN10300_GOT16, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* */ "R_MN10300_GOT16", /* name */ FALSE, /* partial_inplace */ 0xffffffff, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ HOWTO (R_MN10300_COPY, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* */ "R_MN10300_COPY", /* name */ FALSE, /* partial_inplace */ 0xffffffff, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ HOWTO (R_MN10300_GLOB_DAT, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* */ "R_MN10300_GLOB_DAT", /* name */ FALSE, /* partial_inplace */ 0xffffffff, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ HOWTO (R_MN10300_JMP_SLOT, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* */ "R_MN10300_JMP_SLOT", /* name */ FALSE, /* partial_inplace */ 0xffffffff, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ HOWTO (R_MN10300_RELATIVE, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* */ "R_MN10300_RELATIVE", /* name */ FALSE, /* partial_inplace */ 0xffffffff, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ EMPTY_HOWTO (24), EMPTY_HOWTO (25), EMPTY_HOWTO (26), EMPTY_HOWTO (27), EMPTY_HOWTO (28), EMPTY_HOWTO (29), EMPTY_HOWTO (30), EMPTY_HOWTO (31), EMPTY_HOWTO (32), HOWTO (R_MN10300_SYM_DIFF, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont,/* complain_on_overflow */ NULL, /* special handler. */ "R_MN10300_SYM_DIFF", /* name */ FALSE, /* partial_inplace */ 0xffffffff, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ HOWTO (R_MN10300_ALIGN, /* type */ 0, /* rightshift */ 0, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont,/* complain_on_overflow */ NULL, /* special handler. */ "R_MN10300_ALIGN", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ FALSE) /* pcrel_offset */ }; struct mn10300_reloc_map { bfd_reloc_code_real_type bfd_reloc_val; unsigned char elf_reloc_val; }; static const struct mn10300_reloc_map mn10300_reloc_map[] = { { BFD_RELOC_NONE, R_MN10300_NONE, }, { BFD_RELOC_32, R_MN10300_32, }, { BFD_RELOC_16, R_MN10300_16, }, { BFD_RELOC_8, R_MN10300_8, }, { BFD_RELOC_32_PCREL, R_MN10300_PCREL32, }, { BFD_RELOC_16_PCREL, R_MN10300_PCREL16, }, { BFD_RELOC_8_PCREL, R_MN10300_PCREL8, }, { BFD_RELOC_24, R_MN10300_24, }, { BFD_RELOC_VTABLE_INHERIT, R_MN10300_GNU_VTINHERIT }, { BFD_RELOC_VTABLE_ENTRY, R_MN10300_GNU_VTENTRY }, { BFD_RELOC_32_GOT_PCREL, R_MN10300_GOTPC32 }, { BFD_RELOC_16_GOT_PCREL, R_MN10300_GOTPC16 }, { BFD_RELOC_32_GOTOFF, R_MN10300_GOTOFF32 }, { BFD_RELOC_MN10300_GOTOFF24, R_MN10300_GOTOFF24 }, { BFD_RELOC_16_GOTOFF, R_MN10300_GOTOFF16 }, { BFD_RELOC_32_PLT_PCREL, R_MN10300_PLT32 }, { BFD_RELOC_16_PLT_PCREL, R_MN10300_PLT16 }, { BFD_RELOC_MN10300_GOT32, R_MN10300_GOT32 }, { BFD_RELOC_MN10300_GOT24, R_MN10300_GOT24 }, { BFD_RELOC_MN10300_GOT16, R_MN10300_GOT16 }, { BFD_RELOC_MN10300_COPY, R_MN10300_COPY }, { BFD_RELOC_MN10300_GLOB_DAT, R_MN10300_GLOB_DAT }, { BFD_RELOC_MN10300_JMP_SLOT, R_MN10300_JMP_SLOT }, { BFD_RELOC_MN10300_RELATIVE, R_MN10300_RELATIVE }, { BFD_RELOC_MN10300_SYM_DIFF, R_MN10300_SYM_DIFF }, { BFD_RELOC_MN10300_ALIGN, R_MN10300_ALIGN } }; /* Create the GOT section. */ static bfd_boolean _bfd_mn10300_elf_create_got_section (bfd * abfd, struct bfd_link_info * info) { flagword flags; flagword pltflags; asection * s; struct elf_link_hash_entry * h; const struct elf_backend_data * bed = get_elf_backend_data (abfd); int ptralign; /* This function may be called more than once. */ if (bfd_get_section_by_name (abfd, ".got") != NULL) return TRUE; switch (bed->s->arch_size) { case 32: ptralign = 2; break; case 64: ptralign = 3; break; default: bfd_set_error (bfd_error_bad_value); return FALSE; } flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED); pltflags = flags; pltflags |= SEC_CODE; if (bed->plt_not_loaded) pltflags &= ~ (SEC_LOAD | SEC_HAS_CONTENTS); if (bed->plt_readonly) pltflags |= SEC_READONLY; s = bfd_make_section_with_flags (abfd, ".plt", pltflags); if (s == NULL || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment)) return FALSE; /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the .plt section. */ if (bed->want_plt_sym) { h = _bfd_elf_define_linkage_sym (abfd, info, s, "_PROCEDURE_LINKAGE_TABLE_"); elf_hash_table (info)->hplt = h; if (h == NULL) return FALSE; } s = bfd_make_section_with_flags (abfd, ".got", flags); if (s == NULL || ! bfd_set_section_alignment (abfd, s, ptralign)) return FALSE; if (bed->want_got_plt) { s = bfd_make_section_with_flags (abfd, ".got.plt", flags); if (s == NULL || ! bfd_set_section_alignment (abfd, s, ptralign)) return FALSE; } /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got (or .got.plt) section. We don't do this in the linker script because we don't want to define the symbol if we are not creating a global offset table. */ h = _bfd_elf_define_linkage_sym (abfd, info, s, "_GLOBAL_OFFSET_TABLE_"); elf_hash_table (info)->hgot = h; if (h == NULL) return FALSE; /* The first bit of the global offset table is the header. */ s->size += bed->got_header_size; return TRUE; } static reloc_howto_type * bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, bfd_reloc_code_real_type code) { unsigned int i; for (i = ARRAY_SIZE (mn10300_reloc_map); i--;) if (mn10300_reloc_map[i].bfd_reloc_val == code) return &elf_mn10300_howto_table[mn10300_reloc_map[i].elf_reloc_val]; return NULL; } static reloc_howto_type * bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name) { unsigned int i; for (i = ARRAY_SIZE (elf_mn10300_howto_table); i--;) if (elf_mn10300_howto_table[i].name != NULL && strcasecmp (elf_mn10300_howto_table[i].name, r_name) == 0) return elf_mn10300_howto_table + i; return NULL; } /* Set the howto pointer for an MN10300 ELF reloc. */ static void mn10300_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr, Elf_Internal_Rela *dst) { unsigned int r_type; r_type = ELF32_R_TYPE (dst->r_info); BFD_ASSERT (r_type < (unsigned int) R_MN10300_MAX); cache_ptr->howto = elf_mn10300_howto_table + r_type; } /* Look through the relocs for a section during the first phase. Since we don't do .gots or .plts, we just need to consider the virtual table relocs for gc. */ static bfd_boolean mn10300_elf_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sec, const Elf_Internal_Rela *relocs) { bfd_boolean sym_diff_reloc_seen; Elf_Internal_Shdr *symtab_hdr; Elf_Internal_Sym * isymbuf = NULL; struct elf_link_hash_entry **sym_hashes; const Elf_Internal_Rela *rel; const Elf_Internal_Rela *rel_end; bfd * dynobj; bfd_vma * local_got_offsets; asection * sgot; asection * srelgot; asection * sreloc; bfd_boolean result = FALSE; sgot = NULL; srelgot = NULL; sreloc = NULL; if (info->relocatable) return TRUE; symtab_hdr = &elf_tdata (abfd)->symtab_hdr; isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; sym_hashes = elf_sym_hashes (abfd); dynobj = elf_hash_table (info)->dynobj; local_got_offsets = elf_local_got_offsets (abfd); rel_end = relocs + sec->reloc_count; sym_diff_reloc_seen = FALSE; for (rel = relocs; rel < rel_end; rel++) { struct elf_link_hash_entry *h; unsigned long r_symndx; unsigned int r_type; r_symndx = ELF32_R_SYM (rel->r_info); if (r_symndx < symtab_hdr->sh_info) h = NULL; else { h = sym_hashes[r_symndx - symtab_hdr->sh_info]; while (h->root.type == bfd_link_hash_indirect || h->root.type == bfd_link_hash_warning) h = (struct elf_link_hash_entry *) h->root.u.i.link; } r_type = ELF32_R_TYPE (rel->r_info); /* Some relocs require a global offset table. */ if (dynobj == NULL) { switch (r_type) { case R_MN10300_GOT32: case R_MN10300_GOT24: case R_MN10300_GOT16: case R_MN10300_GOTOFF32: case R_MN10300_GOTOFF24: case R_MN10300_GOTOFF16: case R_MN10300_GOTPC32: case R_MN10300_GOTPC16: elf_hash_table (info)->dynobj = dynobj = abfd; if (! _bfd_mn10300_elf_create_got_section (dynobj, info)) goto fail; break; default: break; } } switch (r_type) { /* This relocation describes the C++ object vtable hierarchy. Reconstruct it for later use during GC. */ case R_MN10300_GNU_VTINHERIT: if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) goto fail; break; /* This relocation describes which C++ vtable entries are actually used. Record for later use during GC. */ case R_MN10300_GNU_VTENTRY: BFD_ASSERT (h != NULL); if (h != NULL && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) goto fail; break; case R_MN10300_GOT32: case R_MN10300_GOT24: case R_MN10300_GOT16: /* This symbol requires a global offset table entry. */ if (sgot == NULL) { sgot = bfd_get_section_by_name (dynobj, ".got"); BFD_ASSERT (sgot != NULL); } if (srelgot == NULL && (h != NULL || info->shared)) { srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); if (srelgot == NULL) { srelgot = bfd_make_section_with_flags (dynobj, ".rela.got", (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED | SEC_READONLY)); if (srelgot == NULL || ! bfd_set_section_alignment (dynobj, srelgot, 2)) goto fail; } } if (h != NULL) { if (h->got.offset != (bfd_vma) -1) /* We have already allocated space in the .got. */ break; h->got.offset = sgot->size; /* Make sure this symbol is output as a dynamic symbol. */ if (h->dynindx == -1) { if (! bfd_elf_link_record_dynamic_symbol (info, h)) goto fail; } srelgot->size += sizeof (Elf32_External_Rela); } else { /* This is a global offset table entry for a local symbol. */ if (local_got_offsets == NULL) { size_t size; unsigned int i; size = symtab_hdr->sh_info * sizeof (bfd_vma); local_got_offsets = bfd_alloc (abfd, size); if (local_got_offsets == NULL) goto fail; elf_local_got_offsets (abfd) = local_got_offsets; for (i = 0; i < symtab_hdr->sh_info; i++) local_got_offsets[i] = (bfd_vma) -1; } if (local_got_offsets[r_symndx] != (bfd_vma) -1) /* We have already allocated space in the .got. */ break; local_got_offsets[r_symndx] = sgot->size; if (info->shared) /* If we are generating a shared object, we need to output a R_MN10300_RELATIVE reloc so that the dynamic linker can adjust this GOT entry. */ srelgot->size += sizeof (Elf32_External_Rela); } sgot->size += 4; break; case R_MN10300_PLT32: case R_MN10300_PLT16: /* This symbol requires a procedure linkage table entry. We actually build the entry in adjust_dynamic_symbol, because this might be a case of linking PIC code which is never referenced by a dynamic object, in which case we don't need to generate a procedure linkage table entry after all. */ /* If this is a local symbol, we resolve it directly without creating a procedure linkage table entry. */ if (h == NULL) continue; if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN) break; h->needs_plt = 1; break; case R_MN10300_24: case R_MN10300_16: case R_MN10300_8: case R_MN10300_PCREL32: case R_MN10300_PCREL16: case R_MN10300_PCREL8: if (h != NULL) h->non_got_ref = 1; break; case R_MN10300_SYM_DIFF: sym_diff_reloc_seen = TRUE; break; case R_MN10300_32: if (h != NULL) h->non_got_ref = 1; /* If we are creating a shared library, then we need to copy the reloc into the shared library. */ if (info->shared && (sec->flags & SEC_ALLOC) != 0 /* Do not generate a dynamic reloc for a reloc associated with a SYM_DIFF operation. */ && ! sym_diff_reloc_seen) { asection * sym_section = NULL; /* Find the section containing the symbol involved in the relocation. */ if (h == NULL) { Elf_Internal_Sym * isym; if (isymbuf == NULL) isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, symtab_hdr->sh_info, 0, NULL, NULL, NULL); if (isymbuf) { isym = isymbuf + r_symndx; /* All we care about is whether this local symbol is absolute. */ if (isym->st_shndx == SHN_ABS) sym_section = bfd_abs_section_ptr; } } else { if (h->root.type == bfd_link_hash_defined || h->root.type == bfd_link_hash_defweak) sym_section = h->root.u.def.section; } /* If the symbol is absolute then the relocation can be resolved during linking and there is no need for a dynamic reloc. */ if (sym_section != bfd_abs_section_ptr) { /* When creating a shared object, we must copy these reloc types into the output file. We create a reloc section in dynobj and make room for this reloc. */ if (sreloc == NULL) { sreloc = _bfd_elf_make_dynamic_reloc_section (sec, dynobj, 2, abfd, /*rela?*/ TRUE); if (sreloc == NULL) goto fail; } sreloc->size += sizeof (Elf32_External_Rela); } } break; } if (ELF32_R_TYPE (rel->r_info) != R_MN10300_SYM_DIFF) sym_diff_reloc_seen = FALSE; } result = TRUE; fail: if (isymbuf != NULL) free (isymbuf); return result; } /* Return the section that should be marked against GC for a given relocation. */ static asection * mn10300_elf_gc_mark_hook (asection *sec, struct bfd_link_info *info, Elf_Internal_Rela *rel, struct elf_link_hash_entry *h, Elf_Internal_Sym *sym) { if (h != NULL) switch (ELF32_R_TYPE (rel->r_info)) { case R_MN10300_GNU_VTINHERIT: case R_MN10300_GNU_VTENTRY: return NULL; } return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); } /* Perform a relocation as part of a final link. */ static bfd_reloc_status_type mn10300_elf_final_link_relocate (reloc_howto_type *howto, bfd *input_bfd, bfd *output_bfd ATTRIBUTE_UNUSED, asection *input_section, bfd_byte *contents, bfd_vma offset, bfd_vma value, bfd_vma addend, struct elf_link_hash_entry * h, unsigned long symndx, struct bfd_link_info *info, asection *sym_sec ATTRIBUTE_UNUSED, int is_local ATTRIBUTE_UNUSED) { static asection * sym_diff_section; static bfd_vma sym_diff_value; bfd_boolean is_sym_diff_reloc; unsigned long r_type = howto->type; bfd_byte * hit_data = contents + offset; bfd * dynobj; asection * sgot; asection * splt; asection * sreloc; dynobj = elf_hash_table (info)->dynobj; sgot = NULL; splt = NULL; sreloc = NULL; switch (r_type) { case R_MN10300_24: case R_MN10300_16: case R_MN10300_8: case R_MN10300_PCREL8: case R_MN10300_PCREL16: case R_MN10300_PCREL32: case R_MN10300_GOTOFF32: case R_MN10300_GOTOFF24: case R_MN10300_GOTOFF16: if (info->shared && (input_section->flags & SEC_ALLOC) != 0 && h != NULL && ! SYMBOL_REFERENCES_LOCAL (info, h)) return bfd_reloc_dangerous; } is_sym_diff_reloc = FALSE; if (sym_diff_section != NULL) { BFD_ASSERT (sym_diff_section == input_section); switch (r_type) { case R_MN10300_32: case R_MN10300_24: case R_MN10300_16: case R_MN10300_8: value -= sym_diff_value; /* If we are computing a 32-bit value for the location lists and the result is 0 then we add one to the value. A zero value can result because of linker relaxation deleteing prologue instructions and using a value of 1 (for the begin and end offsets in the location list entry) results in a nul entry which does not prevent the following entries from being parsed. */ if (r_type == R_MN10300_32 && value == 0 && strcmp (input_section->name, ".debug_loc") == 0) value = 1; sym_diff_section = NULL; is_sym_diff_reloc = TRUE; break; default: sym_diff_section = NULL; break; } } switch (r_type) { case R_MN10300_SYM_DIFF: BFD_ASSERT (addend == 0); /* Cache the input section and value. The offset is unreliable, since relaxation may have reduced the following reloc's offset. */ sym_diff_section = input_section; sym_diff_value = value; return bfd_reloc_ok; case R_MN10300_ALIGN: case R_MN10300_NONE: return bfd_reloc_ok; case R_MN10300_32: if (info->shared /* Do not generate relocs when an R_MN10300_32 has been used with an R_MN10300_SYM_DIFF to compute a difference of two symbols. */ && is_sym_diff_reloc == FALSE /* Also, do not generate a reloc when the symbol associated with the R_MN10300_32 reloc is absolute - there is no need for a run time computation in this case. */ && sym_sec != bfd_abs_section_ptr /* If the section is not going to be allocated at load time then there is no need to generate relocs for it. */ && (input_section->flags & SEC_ALLOC) != 0) { Elf_Internal_Rela outrel; bfd_boolean skip, relocate; /* When generating a shared object, these relocations are copied into the output file to be resolved at run time. */ if (sreloc == NULL) { sreloc = _bfd_elf_get_dynamic_reloc_section (input_bfd, input_section, /*rela?*/ TRUE); if (sreloc == NULL) return FALSE; } skip = FALSE; outrel.r_offset = _bfd_elf_section_offset (input_bfd, info, input_section, offset); if (outrel.r_offset == (bfd_vma) -1) skip = TRUE; outrel.r_offset += (input_section->output_section->vma + input_section->output_offset); if (skip) { memset (&outrel, 0, sizeof outrel); relocate = FALSE; } else { /* h->dynindx may be -1 if this symbol was marked to become local. */ if (h == NULL || SYMBOL_REFERENCES_LOCAL (info, h)) { relocate = TRUE; outrel.r_info = ELF32_R_INFO (0, R_MN10300_RELATIVE); outrel.r_addend = value + addend; } else { BFD_ASSERT (h->dynindx != -1); relocate = FALSE; outrel.r_info = ELF32_R_INFO (h->dynindx, R_MN10300_32); outrel.r_addend = value + addend; } } bfd_elf32_swap_reloca_out (output_bfd, &outrel, (bfd_byte *) (((Elf32_External_Rela *) sreloc->contents) + sreloc->reloc_count)); ++sreloc->reloc_count; /* If this reloc is against an external symbol, we do not want to fiddle with the addend. Otherwise, we need to include the symbol value so that it becomes an addend for the dynamic reloc. */ if (! relocate) return bfd_reloc_ok; } value += addend; bfd_put_32 (input_bfd, value, hit_data); return bfd_reloc_ok; case R_MN10300_24: value += addend; if ((long) value > 0x7fffff || (long) value < -0x800000) return bfd_reloc_overflow; bfd_put_8 (input_bfd, value & 0xff, hit_data); bfd_put_8 (input_bfd, (value >> 8) & 0xff, hit_data + 1); bfd_put_8 (input_bfd, (value >> 16) & 0xff, hit_data + 2); return bfd_reloc_ok; case R_MN10300_16: value += addend; if ((long) value > 0x7fff || (long) value < -0x8000) return bfd_reloc_overflow; bfd_put_16 (input_bfd, value, hit_data); return bfd_reloc_ok; case R_MN10300_8: value += addend; if ((long) value > 0x7f || (long) value < -0x80) return bfd_reloc_overflow; bfd_put_8 (input_bfd, value, hit_data); return bfd_reloc_ok; case R_MN10300_PCREL8: value -= (input_section->output_section->vma + input_section->output_offset); value -= offset; value += addend; if ((long) value > 0x7f || (long) value < -0x80) return bfd_reloc_overflow; bfd_put_8 (input_bfd, value, hit_data); return bfd_reloc_ok; case R_MN10300_PCREL16: value -= (input_section->output_section->vma + input_section->output_offset); value -= offset; value += addend; if ((long) value > 0x7fff || (long) value < -0x8000) return bfd_reloc_overflow; bfd_put_16 (input_bfd, value, hit_data); return bfd_reloc_ok; case R_MN10300_PCREL32: value -= (input_section->output_section->vma + input_section->output_offset); value -= offset; value += addend; bfd_put_32 (input_bfd, value, hit_data); return bfd_reloc_ok; case R_MN10300_GNU_VTINHERIT: case R_MN10300_GNU_VTENTRY: return bfd_reloc_ok; case R_MN10300_GOTPC32: /* Use global offset table as symbol value. */ value = bfd_get_section_by_name (dynobj, ".got")->output_section->vma; value -= (input_section->output_section->vma + input_section->output_offset); value -= offset; value += addend; bfd_put_32 (input_bfd, value, hit_data); return bfd_reloc_ok; case R_MN10300_GOTPC16: /* Use global offset table as symbol value. */ value = bfd_get_section_by_name (dynobj, ".got")->output_section->vma; value -= (input_section->output_section->vma + input_section->output_offset); value -= offset; value += addend; if ((long) value > 0x7fff || (long) value < -0x8000) return bfd_reloc_overflow; bfd_put_16 (input_bfd, value, hit_data); return bfd_reloc_ok; case R_MN10300_GOTOFF32: value -= bfd_get_section_by_name (dynobj, ".got")->output_section->vma; value += addend; bfd_put_32 (input_bfd, value, hit_data); return bfd_reloc_ok; case R_MN10300_GOTOFF24: value -= bfd_get_section_by_name (dynobj, ".got")->output_section->vma; value += addend; if ((long) value > 0x7fffff || (long) value < -0x800000) return bfd_reloc_overflow; bfd_put_8 (input_bfd, value, hit_data); bfd_put_8 (input_bfd, (value >> 8) & 0xff, hit_data + 1); bfd_put_8 (input_bfd, (value >> 16) & 0xff, hit_data + 2); return bfd_reloc_ok; case R_MN10300_GOTOFF16: value -= bfd_get_section_by_name (dynobj, ".got")->output_section->vma; value += addend; if ((long) value > 0x7fff || (long) value < -0x8000) return bfd_reloc_overflow; bfd_put_16 (input_bfd, value, hit_data); return bfd_reloc_ok; case R_MN10300_PLT32: if (h != NULL && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN && h->plt.offset != (bfd_vma) -1) { splt = bfd_get_section_by_name (dynobj, ".plt"); value = (splt->output_section->vma + splt->output_offset + h->plt.offset) - value; } value -= (input_section->output_section->vma + input_section->output_offset); value -= offset; value += addend; bfd_put_32 (input_bfd, value, hit_data); return bfd_reloc_ok; case R_MN10300_PLT16: if (h != NULL && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN && h->plt.offset != (bfd_vma) -1) { splt = bfd_get_section_by_name (dynobj, ".plt"); value = (splt->output_section->vma + splt->output_offset + h->plt.offset) - value; } value -= (input_section->output_section->vma + input_section->output_offset); value -= offset; value += addend; if ((long) value > 0x7fff || (long) value < -0x8000) return bfd_reloc_overflow; bfd_put_16 (input_bfd, value, hit_data); return bfd_reloc_ok; case R_MN10300_GOT32: case R_MN10300_GOT24: case R_MN10300_GOT16: { sgot = bfd_get_section_by_name (dynobj, ".got"); if (h != NULL) { bfd_vma off; off = h->got.offset; BFD_ASSERT (off != (bfd_vma) -1); if (! elf_hash_table (info)->dynamic_sections_created || SYMBOL_REFERENCES_LOCAL (info, h)) /* This is actually a static link, or it is a -Bsymbolic link and the symbol is defined locally, or the symbol was forced to be local because of a version file. We must initialize this entry in the global offset table. When doing a dynamic link, we create a .rela.got relocation entry to initialize the value. This is done in the finish_dynamic_symbol routine. */ bfd_put_32 (output_bfd, value, sgot->contents + off); value = sgot->output_offset + off; } else { bfd_vma off; off = elf_local_got_offsets (input_bfd)[symndx]; bfd_put_32 (output_bfd, value, sgot->contents + off); if (info->shared) { asection * srelgot; Elf_Internal_Rela outrel; srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); BFD_ASSERT (srelgot != NULL); outrel.r_offset = (sgot->output_section->vma + sgot->output_offset + off); outrel.r_info = ELF32_R_INFO (0, R_MN10300_RELATIVE); outrel.r_addend = value; bfd_elf32_swap_reloca_out (output_bfd, &outrel, (bfd_byte *) (((Elf32_External_Rela *) srelgot->contents) + srelgot->reloc_count)); ++ srelgot->reloc_count; } value = sgot->output_offset + off; } } value += addend; if (r_type == R_MN10300_GOT32) { bfd_put_32 (input_bfd, value, hit_data); return bfd_reloc_ok; } else if (r_type == R_MN10300_GOT24) { if ((long) value > 0x7fffff || (long) value < -0x800000) return bfd_reloc_overflow; bfd_put_8 (input_bfd, value & 0xff, hit_data); bfd_put_8 (input_bfd, (value >> 8) & 0xff, hit_data + 1); bfd_put_8 (input_bfd, (value >> 16) & 0xff, hit_data + 2); return bfd_reloc_ok; } else if (r_type == R_MN10300_GOT16) { if ((long) value > 0x7fff || (long) value < -0x8000) return bfd_reloc_overflow; bfd_put_16 (input_bfd, value, hit_data); return bfd_reloc_ok; } /* Fall through. */ default: return bfd_reloc_notsupported; } } /* Relocate an MN10300 ELF section. */ static bfd_boolean mn10300_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd, asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs, Elf_Internal_Sym *local_syms, asection **local_sections) { Elf_Internal_Shdr *symtab_hdr; struct elf_link_hash_entry **sym_hashes; Elf_Internal_Rela *rel, *relend; symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; sym_hashes = elf_sym_hashes (input_bfd); rel = relocs; relend = relocs + input_section->reloc_count; for (; rel < relend; rel++) { int r_type; reloc_howto_type *howto; unsigned long r_symndx; Elf_Internal_Sym *sym; asection *sec; struct elf32_mn10300_link_hash_entry *h; bfd_vma relocation; bfd_reloc_status_type r; r_symndx = ELF32_R_SYM (rel->r_info); r_type = ELF32_R_TYPE (rel->r_info); howto = elf_mn10300_howto_table + r_type; /* Just skip the vtable gc relocs. */ if (r_type == R_MN10300_GNU_VTINHERIT || r_type == R_MN10300_GNU_VTENTRY) continue; h = NULL; sym = NULL; sec = NULL; if (r_symndx < symtab_hdr->sh_info) { sym = local_syms + r_symndx; sec = local_sections[r_symndx]; relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); } else { bfd_boolean unresolved_reloc; bfd_boolean warned; struct elf_link_hash_entry *hh; RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, r_symndx, symtab_hdr, sym_hashes, hh, sec, relocation, unresolved_reloc, warned); h = (struct elf32_mn10300_link_hash_entry *) hh; if ((h->root.root.type == bfd_link_hash_defined || h->root.root.type == bfd_link_hash_defweak) && ( r_type == R_MN10300_GOTPC32 || r_type == R_MN10300_GOTPC16 || (( r_type == R_MN10300_PLT32 || r_type == R_MN10300_PLT16) && ELF_ST_VISIBILITY (h->root.other) != STV_INTERNAL && ELF_ST_VISIBILITY (h->root.other) != STV_HIDDEN && h->root.plt.offset != (bfd_vma) -1) || (( r_type == R_MN10300_GOT32 || r_type == R_MN10300_GOT24 || r_type == R_MN10300_GOT16) && elf_hash_table (info)->dynamic_sections_created && !SYMBOL_REFERENCES_LOCAL (info, hh)) || (r_type == R_MN10300_32 /* _32 relocs in executables force _COPY relocs, such that the address of the symbol ends up being local. */ && !info->executable && !SYMBOL_REFERENCES_LOCAL (info, hh) && ((input_section->flags & SEC_ALLOC) != 0 /* DWARF will emit R_MN10300_32 relocations in its sections against symbols defined externally in shared libraries. We can't do anything with them here. */ || ((input_section->flags & SEC_DEBUGGING) != 0 && h->root.def_dynamic))))) /* In these cases, we don't need the relocation value. We check specially because in some obscure cases sec->output_section will be NULL. */ relocation = 0; else if (!info->relocatable && unresolved_reloc) (*_bfd_error_handler) (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), input_bfd, input_section, (long) rel->r_offset, howto->name, h->root.root.root.string); } if (sec != NULL && elf_discarded_section (sec)) { /* For relocs against symbols from removed linkonce sections, or sections discarded by a linker script, we just want the section contents zeroed. Avoid any special processing. */ _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset); rel->r_info = 0; rel->r_addend = 0; continue; } if (info->relocatable) continue; r = mn10300_elf_final_link_relocate (howto, input_bfd, output_bfd, input_section, contents, rel->r_offset, relocation, rel->r_addend, (struct elf_link_hash_entry *) h, r_symndx, info, sec, h == NULL); if (r != bfd_reloc_ok) { const char *name; const char *msg = NULL; if (h != NULL) name = h->root.root.root.string; else { name = (bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link, sym->st_name)); if (name == NULL || *name == '\0') name = bfd_section_name (input_bfd, sec); } switch (r) { case bfd_reloc_overflow: if (! ((*info->callbacks->reloc_overflow) (info, (h ? &h->root.root : NULL), name, howto->name, (bfd_vma) 0, input_bfd, input_section, rel->r_offset))) return FALSE; break; case bfd_reloc_undefined: if (! ((*info->callbacks->undefined_symbol) (info, name, input_bfd, input_section, rel->r_offset, TRUE))) return FALSE; break; case bfd_reloc_outofrange: msg = _("internal error: out of range error"); goto common_error; case bfd_reloc_notsupported: msg = _("internal error: unsupported relocation error"); goto common_error; case bfd_reloc_dangerous: if (r_type == R_MN10300_PCREL32) msg = _("error: inappropriate relocation type for shared" " library (did you forget -fpic?)"); else msg = _("internal error: suspicious relocation type used" " in shared library"); goto common_error; default: msg = _("internal error: unknown error"); /* Fall through. */ common_error: if (!((*info->callbacks->warning) (info, msg, name, input_bfd, input_section, rel->r_offset))) return FALSE; break; } } } return TRUE; } /* Finish initializing one hash table entry. */ static bfd_boolean elf32_mn10300_finish_hash_table_entry (struct bfd_hash_entry *gen_entry, void * in_args) { struct elf32_mn10300_link_hash_entry *entry; struct bfd_link_info *link_info = (struct bfd_link_info *) in_args; unsigned int byte_count = 0; entry = (struct elf32_mn10300_link_hash_entry *) gen_entry; if (entry->root.root.type == bfd_link_hash_warning) entry = (struct elf32_mn10300_link_hash_entry *) entry->root.root.u.i.link; /* If we already know we want to convert "call" to "calls" for calls to this symbol, then return now. */ if (entry->flags == MN10300_CONVERT_CALL_TO_CALLS) return TRUE; /* If there are no named calls to this symbol, or there's nothing we can move from the function itself into the "call" instruction, then note that all "call" instructions should be converted into "calls" instructions and return. If a symbol is available for dynamic symbol resolution (overridable or overriding), avoid custom calling conventions. */ if (entry->direct_calls == 0 || (entry->stack_size == 0 && entry->movm_args == 0) || (elf_hash_table (link_info)->dynamic_sections_created && ELF_ST_VISIBILITY (entry->root.other) != STV_INTERNAL && ELF_ST_VISIBILITY (entry->root.other) != STV_HIDDEN)) { /* Make a note that we should convert "call" instructions to "calls" instructions for calls to this symbol. */ entry->flags |= MN10300_CONVERT_CALL_TO_CALLS; return TRUE; } /* We may be able to move some instructions from the function itself into the "call" instruction. Count how many bytes we might be able to eliminate in the function itself. */ /* A movm instruction is two bytes. */ if (entry->movm_args) byte_count += 2; /* Count the insn to allocate stack space too. */ if (entry->stack_size > 0) { if (entry->stack_size <= 128) byte_count += 3; else byte_count += 4; } /* If using "call" will result in larger code, then turn all the associated "call" instructions into "calls" instructions. */ if (byte_count < entry->direct_calls) entry->flags |= MN10300_CONVERT_CALL_TO_CALLS; /* This routine never fails. */ return TRUE; } /* Used to count hash table entries. */ static bfd_boolean elf32_mn10300_count_hash_table_entries (struct bfd_hash_entry *gen_entry ATTRIBUTE_UNUSED, void * in_args) { int *count = (int *) in_args; (*count) ++; return TRUE; } /* Used to enumerate hash table entries into a linear array. */ static bfd_boolean elf32_mn10300_list_hash_table_entries (struct bfd_hash_entry *gen_entry, void * in_args) { struct bfd_hash_entry ***ptr = (struct bfd_hash_entry ***) in_args; **ptr = gen_entry; (*ptr) ++; return TRUE; } /* Used to sort the array created by the above. */ static int sort_by_value (const void *va, const void *vb) { struct elf32_mn10300_link_hash_entry *a = *(struct elf32_mn10300_link_hash_entry **) va; struct elf32_mn10300_link_hash_entry *b = *(struct elf32_mn10300_link_hash_entry **) vb; return a->value - b->value; } /* Compute the stack size and movm arguments for the function referred to by HASH at address ADDR in section with contents CONTENTS, store the information in the hash table. */ static void compute_function_info (bfd *abfd, struct elf32_mn10300_link_hash_entry *hash, bfd_vma addr, unsigned char *contents) { unsigned char byte1, byte2; /* We only care about a very small subset of the possible prologue sequences here. Basically we look for: movm [d2,d3,a2,a3],sp (optional) add <size>,sp (optional, and only for sizes which fit in an unsigned 8 bit number) If we find anything else, we quit. */ /* Look for movm [regs],sp. */ byte1 = bfd_get_8 (abfd, contents + addr); byte2 = bfd_get_8 (abfd, contents + addr + 1); if (byte1 == 0xcf) { hash->movm_args = byte2; addr += 2; byte1 = bfd_get_8 (abfd, contents + addr); byte2 = bfd_get_8 (abfd, contents + addr + 1); } /* Now figure out how much stack space will be allocated by the movm instruction. We need this kept separate from the function's normal stack space. */ if (hash->movm_args) { /* Space for d2. */ if (hash->movm_args & 0x80) hash->movm_stack_size += 4; /* Space for d3. */ if (hash->movm_args & 0x40) hash->movm_stack_size += 4; /* Space for a2. */ if (hash->movm_args & 0x20) hash->movm_stack_size += 4; /* Space for a3. */ if (hash->movm_args & 0x10) hash->movm_stack_size += 4; /* "other" space. d0, d1, a0, a1, mdr, lir, lar, 4 byte pad. */ if (hash->movm_args & 0x08) hash->movm_stack_size += 8 * 4; if (bfd_get_mach (abfd) == bfd_mach_am33 || bfd_get_mach (abfd) == bfd_mach_am33_2) { /* "exother" space. e0, e1, mdrq, mcrh, mcrl, mcvf */ if (hash->movm_args & 0x1) hash->movm_stack_size += 6 * 4; /* exreg1 space. e4, e5, e6, e7 */ if (hash->movm_args & 0x2) hash->movm_stack_size += 4 * 4; /* exreg0 space. e2, e3 */ if (hash->movm_args & 0x4) hash->movm_stack_size += 2 * 4; } } /* Now look for the two stack adjustment variants. */ if (byte1 == 0xf8 && byte2 == 0xfe) { int temp = bfd_get_8 (abfd, contents + addr + 2); temp = ((temp & 0xff) ^ (~0x7f)) + 0x80; hash->stack_size = -temp; } else if (byte1 == 0xfa && byte2 == 0xfe) { int temp = bfd_get_16 (abfd, contents + addr + 2); temp = ((temp & 0xffff) ^ (~0x7fff)) + 0x8000; temp = -temp; if (temp < 255) hash->stack_size = temp; } /* If the total stack to be allocated by the call instruction is more than 255 bytes, then we can't remove the stack adjustment by using "call" (we might still be able to remove the "movm" instruction. */ if (hash->stack_size + hash->movm_stack_size > 255) hash->stack_size = 0; } /* Delete some bytes from a section while relaxing. */ static bfd_boolean mn10300_elf_relax_delete_bytes (bfd *abfd, asection *sec, bfd_vma addr, int count) { Elf_Internal_Shdr *symtab_hdr; unsigned int sec_shndx; bfd_byte *contents; Elf_Internal_Rela *irel, *irelend; Elf_Internal_Rela *irelalign; bfd_vma toaddr; Elf_Internal_Sym *isym, *isymend; struct elf_link_hash_entry **sym_hashes; struct elf_link_hash_entry **end_hashes; unsigned int symcount; sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); contents = elf_section_data (sec)->this_hdr.contents; irelalign = NULL; toaddr = sec->size; irel = elf_section_data (sec)->relocs; irelend = irel + sec->reloc_count; if (sec->reloc_count > 0) { /* If there is an align reloc at the end of the section ignore it. GAS creates these relocs for reasons of its own, and they just serve to keep the section artifically inflated. */ if (ELF32_R_TYPE ((irelend - 1)->r_info) == (int) R_MN10300_ALIGN) --irelend; /* The deletion must stop at the next ALIGN reloc for an aligment power larger than, or not a multiple of, the number of bytes we are deleting. */ for (; irel < irelend; irel++) { int alignment = 1 << irel->r_addend; if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_ALIGN && irel->r_offset > addr && irel->r_offset < toaddr && (count < alignment || alignment % count != 0)) { irelalign = irel; toaddr = irel->r_offset; break; } } } /* Actually delete the bytes. */ memmove (contents + addr, contents + addr + count, (size_t) (toaddr - addr - count)); /* Adjust the section's size if we are shrinking it, or else pad the bytes between the end of the shrunken region and the start of the next region with NOP codes. */ if (irelalign == NULL) { sec->size -= count; /* Include symbols at the end of the section, but not at the end of a sub-region of the section. */ toaddr ++; } else { int i; #define NOP_OPCODE 0xcb for (i = 0; i < count; i ++) bfd_put_8 (abfd, (bfd_vma) NOP_OPCODE, contents + toaddr - count + i); } /* Adjust all the relocs. */ for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) { /* Get the new reloc address. */ if ((irel->r_offset > addr && irel->r_offset < toaddr) || (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_ALIGN && irel->r_offset == toaddr)) irel->r_offset -= count; } /* Adjust the local symbols in the section, reducing their value by the number of bytes deleted. Note - symbols within the deleted region are moved to the address of the start of the region, which actually means that they will address the byte beyond the end of the region once the deletion has been completed. */ symtab_hdr = &elf_tdata (abfd)->symtab_hdr; isym = (Elf_Internal_Sym *) symtab_hdr->contents; for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++) { if (isym->st_shndx == sec_shndx && isym->st_value > addr && isym->st_value < toaddr) { if (isym->st_value < addr + count) isym->st_value = addr; else isym->st_value -= count; } /* Adjust the function symbol's size as well. */ else if (isym->st_shndx == sec_shndx && ELF_ST_TYPE (isym->st_info) == STT_FUNC && isym->st_value + isym->st_size > addr && isym->st_value + isym->st_size < toaddr) isym->st_size -= count; } /* Now adjust the global symbols defined in this section. */ symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) - symtab_hdr->sh_info); sym_hashes = elf_sym_hashes (abfd); end_hashes = sym_hashes + symcount; for (; sym_hashes < end_hashes; sym_hashes++) { struct elf_link_hash_entry *sym_hash = *sym_hashes; if ((sym_hash->root.type == bfd_link_hash_defined || sym_hash->root.type == bfd_link_hash_defweak) && sym_hash->root.u.def.section == sec && sym_hash->root.u.def.value > addr && sym_hash->root.u.def.value < toaddr) { if (sym_hash->root.u.def.value < addr + count) sym_hash->root.u.def.value = addr; else sym_hash->root.u.def.value -= count; } /* Adjust the function symbol's size as well. */ else if (sym_hash->root.type == bfd_link_hash_defined && sym_hash->root.u.def.section == sec && sym_hash->type == STT_FUNC && sym_hash->root.u.def.value + sym_hash->size > addr && sym_hash->root.u.def.value + sym_hash->size < toaddr) sym_hash->size -= count; } /* See if we can move the ALIGN reloc forward. We have adjusted r_offset for it already. */ if (irelalign != NULL) { bfd_vma alignto, alignaddr; if ((int) irelalign->r_addend > 0) { /* This is the old address. */ alignto = BFD_ALIGN (toaddr, 1 << irelalign->r_addend); /* This is where the align points to now. */ alignaddr = BFD_ALIGN (irelalign->r_offset, 1 << irelalign->r_addend); if (alignaddr < alignto) /* Tail recursion. */ return mn10300_elf_relax_delete_bytes (abfd, sec, alignaddr, (int) (alignto - alignaddr)); } } return TRUE; } /* Return TRUE if a symbol exists at the given address, else return FALSE. */ static bfd_boolean mn10300_elf_symbol_address_p (bfd *abfd, asection *sec, Elf_Internal_Sym *isym, bfd_vma addr) { Elf_Internal_Shdr *symtab_hdr; unsigned int sec_shndx; Elf_Internal_Sym *isymend; struct elf_link_hash_entry **sym_hashes; struct elf_link_hash_entry **end_hashes; unsigned int symcount; sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); /* Examine all the symbols. */ symtab_hdr = &elf_tdata (abfd)->symtab_hdr; for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++) if (isym->st_shndx == sec_shndx && isym->st_value == addr) return TRUE; symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) - symtab_hdr->sh_info); sym_hashes = elf_sym_hashes (abfd); end_hashes = sym_hashes + symcount; for (; sym_hashes < end_hashes; sym_hashes++) { struct elf_link_hash_entry *sym_hash = *sym_hashes; if ((sym_hash->root.type == bfd_link_hash_defined || sym_hash->root.type == bfd_link_hash_defweak) && sym_hash->root.u.def.section == sec && sym_hash->root.u.def.value == addr) return TRUE; } return FALSE; } /* This function handles relaxing for the mn10300. There are quite a few relaxing opportunities available on the mn10300: * calls:32 -> calls:16 2 bytes * call:32 -> call:16 2 bytes * call:32 -> calls:32 1 byte * call:16 -> calls:16 1 byte * These are done anytime using "calls" would result in smaller code, or when necessary to preserve the meaning of the program. * call:32 varies * call:16 * In some circumstances we can move instructions from a function prologue into a "call" instruction. This is only done if the resulting code is no larger than the original code. * jmp:32 -> jmp:16 2 bytes * jmp:16 -> bra:8 1 byte * If the previous instruction is a conditional branch around the jump/bra, we may be able to reverse its condition and change its target to the jump's target. The jump/bra can then be deleted. 2 bytes * mov abs32 -> mov abs16 1 or 2 bytes * Most instructions which accept imm32 can relax to imm16 1 or 2 bytes - Most instructions which accept imm16 can relax to imm8 1 or 2 bytes * Most instructions which accept d32 can relax to d16 1 or 2 bytes - Most instructions which accept d16 can relax to d8 1 or 2 bytes We don't handle imm16->imm8 or d16->d8 as they're very rare and somewhat more difficult to support. */ static bfd_boolean mn10300_elf_relax_section (bfd *abfd, asection *sec, struct bfd_link_info *link_info, bfd_boolean *again) { Elf_Internal_Shdr *symtab_hdr; Elf_Internal_Rela *internal_relocs = NULL; Elf_Internal_Rela *irel, *irelend; bfd_byte *contents = NULL; Elf_Internal_Sym *isymbuf = NULL; struct elf32_mn10300_link_hash_table *hash_table; asection *section = sec; bfd_vma align_gap_adjustment; if (link_info->relocatable) (*link_info->callbacks->einfo) (_("%P%F: --relax and -r may not be used together\n")); /* Assume nothing changes. */ *again = FALSE; /* We need a pointer to the mn10300 specific hash table. */ hash_table = elf32_mn10300_hash_table (link_info); if (hash_table == NULL) return FALSE; /* Initialize fields in each hash table entry the first time through. */ if ((hash_table->flags & MN10300_HASH_ENTRIES_INITIALIZED) == 0) { bfd *input_bfd; /* Iterate over all the input bfds. */ for (input_bfd = link_info->input_bfds; input_bfd != NULL; input_bfd = input_bfd->link_next) { /* We're going to need all the symbols for each bfd. */ symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; if (symtab_hdr->sh_info != 0) { isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; if (isymbuf == NULL) isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, symtab_hdr->sh_info, 0, NULL, NULL, NULL); if (isymbuf == NULL) goto error_return; } /* Iterate over each section in this bfd. */ for (section = input_bfd->sections; section != NULL; section = section->next) { struct elf32_mn10300_link_hash_entry *hash; asection *sym_sec = NULL; const char *sym_name; char *new_name; /* If there's nothing to do in this section, skip it. */ if (! ((section->flags & SEC_RELOC) != 0 && section->reloc_count != 0)) continue; if ((section->flags & SEC_ALLOC) == 0) continue; /* Get cached copy of section contents if it exists. */ if (elf_section_data (section)->this_hdr.contents != NULL) contents = elf_section_data (section)->this_hdr.contents; else if (section->size != 0) { /* Go get them off disk. */ if (!bfd_malloc_and_get_section (input_bfd, section, &contents)) goto error_return; } else contents = NULL; /* If there aren't any relocs, then there's nothing to do. */ if ((section->flags & SEC_RELOC) != 0 && section->reloc_count != 0) { /* Get a copy of the native relocations. */ internal_relocs = _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL, link_info->keep_memory); if (internal_relocs == NULL) goto error_return; /* Now examine each relocation. */ irel = internal_relocs; irelend = irel + section->reloc_count; for (; irel < irelend; irel++) { long r_type; unsigned long r_index; unsigned char code; r_type = ELF32_R_TYPE (irel->r_info); r_index = ELF32_R_SYM (irel->r_info); if (r_type < 0 || r_type >= (int) R_MN10300_MAX) goto error_return; /* We need the name and hash table entry of the target symbol! */ hash = NULL; sym_sec = NULL; if (r_index < symtab_hdr->sh_info) { /* A local symbol. */ Elf_Internal_Sym *isym; struct elf_link_hash_table *elftab; bfd_size_type amt; isym = isymbuf + r_index; if (isym->st_shndx == SHN_UNDEF) sym_sec = bfd_und_section_ptr; else if (isym->st_shndx == SHN_ABS) sym_sec = bfd_abs_section_ptr; else if (isym->st_shndx == SHN_COMMON) sym_sec = bfd_com_section_ptr; else sym_sec = bfd_section_from_elf_index (input_bfd, isym->st_shndx); sym_name = bfd_elf_string_from_elf_section (input_bfd, (symtab_hdr ->sh_link), isym->st_name); /* If it isn't a function, then we don't care about it. */ if (ELF_ST_TYPE (isym->st_info) != STT_FUNC) continue; /* Tack on an ID so we can uniquely identify this local symbol in the global hash table. */ amt = strlen (sym_name) + 10; new_name = bfd_malloc (amt); if (new_name == NULL) goto error_return; sprintf (new_name, "%s_%08x", sym_name, sym_sec->id); sym_name = new_name; elftab = &hash_table->static_hash_table->root; hash = ((struct elf32_mn10300_link_hash_entry *) elf_link_hash_lookup (elftab, sym_name, TRUE, TRUE, FALSE)); free (new_name); } else { r_index -= symtab_hdr->sh_info; hash = (struct elf32_mn10300_link_hash_entry *) elf_sym_hashes (input_bfd)[r_index]; } sym_name = hash->root.root.root.string; if ((section->flags & SEC_CODE) != 0) { /* If this is not a "call" instruction, then we should convert "call" instructions to "calls" instructions. */ code = bfd_get_8 (input_bfd, contents + irel->r_offset - 1); if (code != 0xdd && code != 0xcd) hash->flags |= MN10300_CONVERT_CALL_TO_CALLS; } /* If this is a jump/call, then bump the direct_calls counter. Else force "call" to "calls" conversions. */ if (r_type == R_MN10300_PCREL32 || r_type == R_MN10300_PLT32 || r_type == R_MN10300_PLT16 || r_type == R_MN10300_PCREL16) hash->direct_calls++; else hash->flags |= MN10300_CONVERT_CALL_TO_CALLS; } } /* Now look at the actual contents to get the stack size, and a list of what registers were saved in the prologue (ie movm_args). */ if ((section->flags & SEC_CODE) != 0) { Elf_Internal_Sym *isym, *isymend; unsigned int sec_shndx; struct elf_link_hash_entry **hashes; struct elf_link_hash_entry **end_hashes; unsigned int symcount; sec_shndx = _bfd_elf_section_from_bfd_section (input_bfd, section); symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) - symtab_hdr->sh_info); hashes = elf_sym_hashes (input_bfd); end_hashes = hashes + symcount; /* Look at each function defined in this section and update info for that function. */ isymend = isymbuf + symtab_hdr->sh_info; for (isym = isymbuf; isym < isymend; isym++) { if (isym->st_shndx == sec_shndx && ELF_ST_TYPE (isym->st_info) == STT_FUNC) { struct elf_link_hash_table *elftab; bfd_size_type amt; struct elf_link_hash_entry **lhashes = hashes; /* Skip a local symbol if it aliases a global one. */ for (; lhashes < end_hashes; lhashes++) { hash = (struct elf32_mn10300_link_hash_entry *) *lhashes; if ((hash->root.root.type == bfd_link_hash_defined || hash->root.root.type == bfd_link_hash_defweak) && hash->root.root.u.def.section == section && hash->root.type == STT_FUNC && hash->root.root.u.def.value == isym->st_value) break; } if (lhashes != end_hashes) continue; if (isym->st_shndx == SHN_UNDEF) sym_sec = bfd_und_section_ptr; else if (isym->st_shndx == SHN_ABS) sym_sec = bfd_abs_section_ptr; else if (isym->st_shndx == SHN_COMMON) sym_sec = bfd_com_section_ptr; else sym_sec = bfd_section_from_elf_index (input_bfd, isym->st_shndx); sym_name = (bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link, isym->st_name)); /* Tack on an ID so we can uniquely identify this local symbol in the global hash table. */ amt = strlen (sym_name) + 10; new_name = bfd_malloc (amt); if (new_name == NULL) goto error_return; sprintf (new_name, "%s_%08x", sym_name, sym_sec->id); sym_name = new_name; elftab = &hash_table->static_hash_table->root; hash = ((struct elf32_mn10300_link_hash_entry *) elf_link_hash_lookup (elftab, sym_name, TRUE, TRUE, FALSE)); free (new_name); compute_function_info (input_bfd, hash, isym->st_value, contents); hash->value = isym->st_value; } } for (; hashes < end_hashes; hashes++) { hash = (struct elf32_mn10300_link_hash_entry *) *hashes; if ((hash->root.root.type == bfd_link_hash_defined || hash->root.root.type == bfd_link_hash_defweak) && hash->root.root.u.def.section == section && hash->root.type == STT_FUNC) compute_function_info (input_bfd, hash, (hash)->root.root.u.def.value, contents); } } /* Cache or free any memory we allocated for the relocs. */ if (internal_relocs != NULL && elf_section_data (section)->relocs != internal_relocs) free (internal_relocs); internal_relocs = NULL; /* Cache or free any memory we allocated for the contents. */ if (contents != NULL && elf_section_data (section)->this_hdr.contents != contents) { if (! link_info->keep_memory) free (contents); else { /* Cache the section contents for elf_link_input_bfd. */ elf_section_data (section)->this_hdr.contents = contents; } } contents = NULL; } /* Cache or free any memory we allocated for the symbols. */ if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) { if (! link_info->keep_memory) free (isymbuf); else { /* Cache the symbols for elf_link_input_bfd. */ symtab_hdr->contents = (unsigned char *) isymbuf; } } isymbuf = NULL; } /* Now iterate on each symbol in the hash table and perform the final initialization steps on each. */ elf32_mn10300_link_hash_traverse (hash_table, elf32_mn10300_finish_hash_table_entry, link_info); elf32_mn10300_link_hash_traverse (hash_table->static_hash_table, elf32_mn10300_finish_hash_table_entry, link_info); { /* This section of code collects all our local symbols, sorts them by value, and looks for multiple symbols referring to the same address. For those symbols, the flags are merged. At this point, the only flag that can be set is MN10300_CONVERT_CALL_TO_CALLS, so we simply OR the flags together. */ int static_count = 0, i; struct elf32_mn10300_link_hash_entry **entries; struct elf32_mn10300_link_hash_entry **ptr; elf32_mn10300_link_hash_traverse (hash_table->static_hash_table, elf32_mn10300_count_hash_table_entries, &static_count); entries = bfd_malloc (static_count * sizeof (* ptr)); ptr = entries; elf32_mn10300_link_hash_traverse (hash_table->static_hash_table, elf32_mn10300_list_hash_table_entries, & ptr); qsort (entries, static_count, sizeof (entries[0]), sort_by_value); for (i = 0; i < static_count - 1; i++) if (entries[i]->value && entries[i]->value == entries[i+1]->value) { int v = entries[i]->flags; int j; for (j = i + 1; j < static_count && entries[j]->value == entries[i]->value; j++) v |= entries[j]->flags; for (j = i; j < static_count && entries[j]->value == entries[i]->value; j++) entries[j]->flags = v; i = j - 1; } } /* All entries in the hash table are fully initialized. */ hash_table->flags |= MN10300_HASH_ENTRIES_INITIALIZED; /* Now that everything has been initialized, go through each code section and delete any prologue insns which will be redundant because their operations will be performed by a "call" instruction. */ for (input_bfd = link_info->input_bfds; input_bfd != NULL; input_bfd = input_bfd->link_next) { /* We're going to need all the local symbols for each bfd. */ symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; if (symtab_hdr->sh_info != 0) { isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; if (isymbuf == NULL) isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, symtab_hdr->sh_info, 0, NULL, NULL, NULL); if (isymbuf == NULL) goto error_return; } /* Walk over each section in this bfd. */ for (section = input_bfd->sections; section != NULL; section = section->next) { unsigned int sec_shndx; Elf_Internal_Sym *isym, *isymend; struct elf_link_hash_entry **hashes; struct elf_link_hash_entry **end_hashes; unsigned int symcount; /* Skip non-code sections and empty sections. */ if ((section->flags & SEC_CODE) == 0 || section->size == 0) continue; if (section->reloc_count != 0) { /* Get a copy of the native relocations. */ internal_relocs = _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL, link_info->keep_memory); if (internal_relocs == NULL) goto error_return; } /* Get cached copy of section contents if it exists. */ if (elf_section_data (section)->this_hdr.contents != NULL) contents = elf_section_data (section)->this_hdr.contents; else { /* Go get them off disk. */ if (!bfd_malloc_and_get_section (input_bfd, section, &contents)) goto error_return; } sec_shndx = _bfd_elf_section_from_bfd_section (input_bfd, section); /* Now look for any function in this section which needs insns deleted from its prologue. */ isymend = isymbuf + symtab_hdr->sh_info; for (isym = isymbuf; isym < isymend; isym++) { struct elf32_mn10300_link_hash_entry *sym_hash; asection *sym_sec = NULL; const char *sym_name; char *new_name; struct elf_link_hash_table *elftab; bfd_size_type amt; if (isym->st_shndx != sec_shndx) continue; if (isym->st_shndx == SHN_UNDEF) sym_sec = bfd_und_section_ptr; else if (isym->st_shndx == SHN_ABS) sym_sec = bfd_abs_section_ptr; else if (isym->st_shndx == SHN_COMMON) sym_sec = bfd_com_section_ptr; else sym_sec = bfd_section_from_elf_index (input_bfd, isym->st_shndx); sym_name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link, isym->st_name); /* Tack on an ID so we can uniquely identify this local symbol in the global hash table. */ amt = strlen (sym_name) + 10; new_name = bfd_malloc (amt); if (new_name == NULL) goto error_return; sprintf (new_name, "%s_%08x", sym_name, sym_sec->id); sym_name = new_name; elftab = & hash_table->static_hash_table->root; sym_hash = (struct elf32_mn10300_link_hash_entry *) elf_link_hash_lookup (elftab, sym_name, FALSE, FALSE, FALSE); free (new_name); if (sym_hash == NULL) continue; if (! (sym_hash->flags & MN10300_CONVERT_CALL_TO_CALLS) && ! (sym_hash->flags & MN10300_DELETED_PROLOGUE_BYTES)) { int bytes = 0; /* Note that we've changed things. */ elf_section_data (section)->relocs = internal_relocs; elf_section_data (section)->this_hdr.contents = contents; symtab_hdr->contents = (unsigned char *) isymbuf; /* Count how many bytes we're going to delete. */ if (sym_hash->movm_args) bytes += 2; if (sym_hash->stack_size > 0) { if (sym_hash->stack_size <= 128) bytes += 3; else bytes += 4; } /* Note that we've deleted prologue bytes for this function. */ sym_hash->flags |= MN10300_DELETED_PROLOGUE_BYTES; /* Actually delete the bytes. */ if (!mn10300_elf_relax_delete_bytes (input_bfd, section, isym->st_value, bytes)) goto error_return; /* Something changed. Not strictly necessary, but may lead to more relaxing opportunities. */ *again = TRUE; } } /* Look for any global functions in this section which need insns deleted from their prologues. */ symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) - symtab_hdr->sh_info); hashes = elf_sym_hashes (input_bfd); end_hashes = hashes + symcount; for (; hashes < end_hashes; hashes++) { struct elf32_mn10300_link_hash_entry *sym_hash; sym_hash = (struct elf32_mn10300_link_hash_entry *) *hashes; if ((sym_hash->root.root.type == bfd_link_hash_defined || sym_hash->root.root.type == bfd_link_hash_defweak) && sym_hash->root.root.u.def.section == section && ! (sym_hash->flags & MN10300_CONVERT_CALL_TO_CALLS) && ! (sym_hash->flags & MN10300_DELETED_PROLOGUE_BYTES)) { int bytes = 0; bfd_vma symval; /* Note that we've changed things. */ elf_section_data (section)->relocs = internal_relocs; elf_section_data (section)->this_hdr.contents = contents; symtab_hdr->contents = (unsigned char *) isymbuf; /* Count how many bytes we're going to delete. */ if (sym_hash->movm_args) bytes += 2; if (sym_hash->stack_size > 0) { if (sym_hash->stack_size <= 128) bytes += 3; else bytes += 4; } /* Note that we've deleted prologue bytes for this function. */ sym_hash->flags |= MN10300_DELETED_PROLOGUE_BYTES; /* Actually delete the bytes. */ symval = sym_hash->root.root.u.def.value; if (!mn10300_elf_relax_delete_bytes (input_bfd, section, symval, bytes)) goto error_return; /* Something changed. Not strictly necessary, but may lead to more relaxing opportunities. */ *again = TRUE; } } /* Cache or free any memory we allocated for the relocs. */ if (internal_relocs != NULL && elf_section_data (section)->relocs != internal_relocs) free (internal_relocs); internal_relocs = NULL; /* Cache or free any memory we allocated for the contents. */ if (contents != NULL && elf_section_data (section)->this_hdr.contents != contents) { if (! link_info->keep_memory) free (contents); else /* Cache the section contents for elf_link_input_bfd. */ elf_section_data (section)->this_hdr.contents = contents; } contents = NULL; } /* Cache or free any memory we allocated for the symbols. */ if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) { if (! link_info->keep_memory) free (isymbuf); else /* Cache the symbols for elf_link_input_bfd. */ symtab_hdr->contents = (unsigned char *) isymbuf; } isymbuf = NULL; } } /* (Re)initialize for the basic instruction shortening/relaxing pass. */ contents = NULL; internal_relocs = NULL; isymbuf = NULL; /* For error_return. */ section = sec; /* We don't have to do anything for a relocatable link, if this section does not have relocs, or if this is not a code section. */ if (link_info->relocatable || (sec->flags & SEC_RELOC) == 0 || sec->reloc_count == 0 || (sec->flags & SEC_CODE) == 0) return TRUE; symtab_hdr = &elf_tdata (abfd)->symtab_hdr; /* Get a copy of the native relocations. */ internal_relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, link_info->keep_memory); if (internal_relocs == NULL) goto error_return; /* Scan for worst case alignment gap changes. Note that this logic is not ideal; what we should do is run this scan for every opcode/address range and adjust accordingly, but that's expensive. Worst case is that for an alignment of N bytes, we move by 2*N-N-1 bytes, assuming we have aligns of 1, 2, 4, 8, etc all before it. Plus, this still doesn't cover cross-section jumps with section alignment. */ irelend = internal_relocs + sec->reloc_count; align_gap_adjustment = 0; for (irel = internal_relocs; irel < irelend; irel++) { if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_ALIGN) { bfd_vma adj = 1 << irel->r_addend; bfd_vma aend = irel->r_offset; aend = BFD_ALIGN (aend, 1 << irel->r_addend); adj = 2 * adj - adj - 1; /* Record the biggest adjustmnet. Skip any alignment at the end of our section. */ if (align_gap_adjustment < adj && aend < sec->output_section->vma + sec->output_offset + sec->size) align_gap_adjustment = adj; } } /* Walk through them looking for relaxing opportunities. */ irelend = internal_relocs + sec->reloc_count; for (irel = internal_relocs; irel < irelend; irel++) { bfd_vma symval; bfd_signed_vma jump_offset; asection *sym_sec = NULL; struct elf32_mn10300_link_hash_entry *h = NULL; /* If this isn't something that can be relaxed, then ignore this reloc. */ if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_NONE || ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_8 || ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_MAX) continue; /* Get the section contents if we haven't done so already. */ if (contents == NULL) { /* Get cached copy if it exists. */ if (elf_section_data (sec)->this_hdr.contents != NULL) contents = elf_section_data (sec)->this_hdr.contents; else { /* Go get them off disk. */ if (!bfd_malloc_and_get_section (abfd, sec, &contents)) goto error_return; } } /* Read this BFD's symbols if we haven't done so already. */ if (isymbuf == NULL && symtab_hdr->sh_info != 0) { isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; if (isymbuf == NULL) isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, symtab_hdr->sh_info, 0, NULL, NULL, NULL); if (isymbuf == NULL) goto error_return; } /* Get the value of the symbol referred to by the reloc. */ if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) { Elf_Internal_Sym *isym; const char *sym_name; char *new_name; /* A local symbol. */ isym = isymbuf + ELF32_R_SYM (irel->r_info); if (isym->st_shndx == SHN_UNDEF) sym_sec = bfd_und_section_ptr; else if (isym->st_shndx == SHN_ABS) sym_sec = bfd_abs_section_ptr; else if (isym->st_shndx == SHN_COMMON) sym_sec = bfd_com_section_ptr; else sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); sym_name = bfd_elf_string_from_elf_section (abfd, symtab_hdr->sh_link, isym->st_name); if ((sym_sec->flags & SEC_MERGE) && sym_sec->sec_info_type == ELF_INFO_TYPE_MERGE) { symval = isym->st_value; /* GAS may reduce relocations against symbols in SEC_MERGE sections to a relocation against the section symbol when the original addend was zero. When the reloc is against a section symbol we should include the addend in the offset passed to _bfd_merged_section_offset, since the location of interest is the original symbol. On the other hand, an access to "sym+addend" where "sym" is not a section symbol should not include the addend; Such an access is presumed to be an offset from "sym"; The location of interest is just "sym". */ if (ELF_ST_TYPE (isym->st_info) == STT_SECTION) symval += irel->r_addend; symval = _bfd_merged_section_offset (abfd, & sym_sec, elf_section_data (sym_sec)->sec_info, symval); if (ELF_ST_TYPE (isym->st_info) != STT_SECTION) symval += irel->r_addend; symval += sym_sec->output_section->vma + sym_sec->output_offset - irel->r_addend; } else symval = (isym->st_value + sym_sec->output_section->vma + sym_sec->output_offset); /* Tack on an ID so we can uniquely identify this local symbol in the global hash table. */ new_name = bfd_malloc ((bfd_size_type) strlen (sym_name) + 10); if (new_name == NULL) goto error_return; sprintf (new_name, "%s_%08x", sym_name, sym_sec->id); sym_name = new_name; h = (struct elf32_mn10300_link_hash_entry *) elf_link_hash_lookup (&hash_table->static_hash_table->root, sym_name, FALSE, FALSE, FALSE); free (new_name); } else { unsigned long indx; /* An external symbol. */ indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; h = (struct elf32_mn10300_link_hash_entry *) (elf_sym_hashes (abfd)[indx]); BFD_ASSERT (h != NULL); if (h->root.root.type != bfd_link_hash_defined && h->root.root.type != bfd_link_hash_defweak) /* This appears to be a reference to an undefined symbol. Just ignore it--it will be caught by the regular reloc processing. */ continue; /* Check for a reference to a discarded symbol and ignore it. */ if (h->root.root.u.def.section->output_section == NULL) continue; sym_sec = h->root.root.u.def.section->output_section; symval = (h->root.root.u.def.value + h->root.root.u.def.section->output_section->vma + h->root.root.u.def.section->output_offset); } /* For simplicity of coding, we are going to modify the section contents, the section relocs, and the BFD symbol table. We must tell the rest of the code not to free up this information. It would be possible to instead create a table of changes which have to be made, as is done in coff-mips.c; that would be more work, but would require less memory when the linker is run. */ /* Try to turn a 32bit pc-relative branch/call into a 16bit pc-relative branch/call, also deal with "call" -> "calls" conversions and insertion of prologue data into "call" instructions. */ if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_PCREL32 || ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_PLT32) { bfd_vma value = symval; if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_PLT32 && h != NULL && ELF_ST_VISIBILITY (h->root.other) != STV_INTERNAL && ELF_ST_VISIBILITY (h->root.other) != STV_HIDDEN && h->root.plt.offset != (bfd_vma) -1) { asection * splt; splt = bfd_get_section_by_name (elf_hash_table (link_info) ->dynobj, ".plt"); value = ((splt->output_section->vma + splt->output_offset + h->root.plt.offset) - (sec->output_section->vma + sec->output_offset + irel->r_offset)); } /* If we've got a "call" instruction that needs to be turned into a "calls" instruction, do so now. It saves a byte. */ if (h && (h->flags & MN10300_CONVERT_CALL_TO_CALLS)) { unsigned char code; /* Get the opcode. */ code = bfd_get_8 (abfd, contents + irel->r_offset - 1); /* Make sure we're working with a "call" instruction! */ if (code == 0xdd) { /* Note that we've changed the relocs, section contents, etc. */ elf_section_data (sec)->relocs = internal_relocs; elf_section_data (sec)->this_hdr.contents = contents; symtab_hdr->contents = (unsigned char *) isymbuf; /* Fix the opcode. */ bfd_put_8 (abfd, 0xfc, contents + irel->r_offset - 1); bfd_put_8 (abfd, 0xff, contents + irel->r_offset); /* Fix irel->r_offset and irel->r_addend. */ irel->r_offset += 1; irel->r_addend += 1; /* Delete one byte of data. */ if (!mn10300_elf_relax_delete_bytes (abfd, sec, irel->r_offset + 3, 1)) goto error_return; /* That will change things, so, we should relax again. Note that this is not required, and it may be slow. */ *again = TRUE; } } else if (h) { /* We've got a "call" instruction which needs some data from target function filled in. */ unsigned char code; /* Get the opcode. */ code = bfd_get_8 (abfd, contents + irel->r_offset - 1); /* Insert data from the target function into the "call" instruction if needed. */ if (code == 0xdd) { bfd_put_8 (abfd, h->movm_args, contents + irel->r_offset + 4); bfd_put_8 (abfd, h->stack_size + h->movm_stack_size, contents + irel->r_offset + 5); } } /* Deal with pc-relative gunk. */ value -= (sec->output_section->vma + sec->output_offset); value -= irel->r_offset; value += irel->r_addend; /* See if the value will fit in 16 bits, note the high value is 0x7fff + 2 as the target will be two bytes closer if we are able to relax, if it's in the same section. */ if (sec->output_section == sym_sec->output_section) jump_offset = 0x8001; else jump_offset = 0x7fff; /* Account for jumps across alignment boundaries using align_gap_adjustment. */ if ((bfd_signed_vma) value < jump_offset - (bfd_signed_vma) align_gap_adjustment && ((bfd_signed_vma) value > -0x8000 + (bfd_signed_vma) align_gap_adjustment)) { unsigned char code; /* Get the opcode. */ code = bfd_get_8 (abfd, contents + irel->r_offset - 1); if (code != 0xdc && code != 0xdd && code != 0xff) continue; /* Note that we've changed the relocs, section contents, etc. */ elf_section_data (sec)->relocs = internal_relocs; elf_section_data (sec)->this_hdr.contents = contents; symtab_hdr->contents = (unsigned char *) isymbuf; /* Fix the opcode. */ if (code == 0xdc) bfd_put_8 (abfd, 0xcc, contents + irel->r_offset - 1); else if (code == 0xdd) bfd_put_8 (abfd, 0xcd, contents + irel->r_offset - 1); else if (code == 0xff) bfd_put_8 (abfd, 0xfa, contents + irel->r_offset - 2); /* Fix the relocation's type. */ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_PLT32) ? R_MN10300_PLT16 : R_MN10300_PCREL16); /* Delete two bytes of data. */ if (!mn10300_elf_relax_delete_bytes (abfd, sec, irel->r_offset + 1, 2)) goto error_return; /* That will change things, so, we should relax again. Note that this is not required, and it may be slow. */ *again = TRUE; } } /* Try to turn a 16bit pc-relative branch into a 8bit pc-relative branch. */ if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_PCREL16) { bfd_vma value = symval; /* If we've got a "call" instruction that needs to be turned into a "calls" instruction, do so now. It saves a byte. */ if (h && (h->flags & MN10300_CONVERT_CALL_TO_CALLS)) { unsigned char code; /* Get the opcode. */ code = bfd_get_8 (abfd, contents + irel->r_offset - 1); /* Make sure we're working with a "call" instruction! */ if (code == 0xcd) { /* Note that we've changed the relocs, section contents, etc. */ elf_section_data (sec)->relocs = internal_relocs; elf_section_data (sec)->this_hdr.contents = contents; symtab_hdr->contents = (unsigned char *) isymbuf; /* Fix the opcode. */ bfd_put_8 (abfd, 0xfa, contents + irel->r_offset - 1); bfd_put_8 (abfd, 0xff, contents + irel->r_offset); /* Fix irel->r_offset and irel->r_addend. */ irel->r_offset += 1; irel->r_addend += 1; /* Delete one byte of data. */ if (!mn10300_elf_relax_delete_bytes (abfd, sec, irel->r_offset + 1, 1)) goto error_return; /* That will change things, so, we should relax again. Note that this is not required, and it may be slow. */ *again = TRUE; } } else if (h) { unsigned char code; /* Get the opcode. */ code = bfd_get_8 (abfd, contents + irel->r_offset - 1); /* Insert data from the target function into the "call" instruction if needed. */ if (code == 0xcd) { bfd_put_8 (abfd, h->movm_args, contents + irel->r_offset + 2); bfd_put_8 (abfd, h->stack_size + h->movm_stack_size, contents + irel->r_offset + 3); } } /* Deal with pc-relative gunk. */ value -= (sec->output_section->vma + sec->output_offset); value -= irel->r_offset; value += irel->r_addend; /* See if the value will fit in 8 bits, note the high value is 0x7f + 1 as the target will be one bytes closer if we are able to relax. */ if ((long) value < 0x80 && (long) value > -0x80) { unsigned char code; /* Get the opcode. */ code = bfd_get_8 (abfd, contents + irel->r_offset - 1); if (code != 0xcc) continue; /* Note that we've changed the relocs, section contents, etc. */ elf_section_data (sec)->relocs = internal_relocs; elf_section_data (sec)->this_hdr.contents = contents; symtab_hdr->contents = (unsigned char *) isymbuf; /* Fix the opcode. */ bfd_put_8 (abfd, 0xca, contents + irel->r_offset - 1); /* Fix the relocation's type. */ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), R_MN10300_PCREL8); /* Delete one byte of data. */ if (!mn10300_elf_relax_delete_bytes (abfd, sec, irel->r_offset + 1, 1)) goto error_return; /* That will change things, so, we should relax again. Note that this is not required, and it may be slow. */ *again = TRUE; } } /* Try to eliminate an unconditional 8 bit pc-relative branch which immediately follows a conditional 8 bit pc-relative branch around the unconditional branch. original: new: bCC lab1 bCC' lab2 bra lab2 lab1: lab1: This happens when the bCC can't reach lab2 at assembly time, but due to other relaxations it can reach at link time. */ if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_PCREL8) { Elf_Internal_Rela *nrel; bfd_vma value = symval; unsigned char code; /* Deal with pc-relative gunk. */ value -= (sec->output_section->vma + sec->output_offset); value -= irel->r_offset; value += irel->r_addend; /* Do nothing if this reloc is the last byte in the section. */ if (irel->r_offset == sec->size) continue; /* See if the next instruction is an unconditional pc-relative branch, more often than not this test will fail, so we test it first to speed things up. */ code = bfd_get_8 (abfd, contents + irel->r_offset + 1); if (code != 0xca) continue; /* Also make sure the next relocation applies to the next instruction and that it's a pc-relative 8 bit branch. */ nrel = irel + 1; if (nrel == irelend || irel->r_offset + 2 != nrel->r_offset || ELF32_R_TYPE (nrel->r_info) != (int) R_MN10300_PCREL8) continue; /* Make sure our destination immediately follows the unconditional branch. */ if (symval != (sec->output_section->vma + sec->output_offset + irel->r_offset + 3)) continue; /* Now make sure we are a conditional branch. This may not be necessary, but why take the chance. Note these checks assume that R_MN10300_PCREL8 relocs only occur on bCC and bCCx insns. If they occured elsewhere, we'd need to know the start of this insn for this check to be accurate. */ code = bfd_get_8 (abfd, contents + irel->r_offset - 1); if (code != 0xc0 && code != 0xc1 && code != 0xc2 && code != 0xc3 && code != 0xc4 && code != 0xc5 && code != 0xc6 && code != 0xc7 && code != 0xc8 && code != 0xc9 && code != 0xe8 && code != 0xe9 && code != 0xea && code != 0xeb) continue; /* We also have to be sure there is no symbol/label at the unconditional branch. */ if (mn10300_elf_symbol_address_p (abfd, sec, isymbuf, irel->r_offset + 1)) continue; /* Note that we've changed the relocs, section contents, etc. */ elf_section_data (sec)->relocs = internal_relocs; elf_section_data (sec)->this_hdr.contents = contents; symtab_hdr->contents = (unsigned char *) isymbuf; /* Reverse the condition of the first branch. */ switch (code) { case 0xc8: code = 0xc9; break; case 0xc9: code = 0xc8; break; case 0xc0: code = 0xc2; break; case 0xc2: code = 0xc0; break; case 0xc3: code = 0xc1; break; case 0xc1: code = 0xc3; break; case 0xc4: code = 0xc6; break; case 0xc6: code = 0xc4; break; case 0xc7: code = 0xc5; break; case 0xc5: code = 0xc7; break; case 0xe8: code = 0xe9; break; case 0x9d: code = 0xe8; break; case 0xea: code = 0xeb; break; case 0xeb: code = 0xea; break; } bfd_put_8 (abfd, code, contents + irel->r_offset - 1); /* Set the reloc type and symbol for the first branch from the second branch. */ irel->r_info = nrel->r_info; /* Make the reloc for the second branch a null reloc. */ nrel->r_info = ELF32_R_INFO (ELF32_R_SYM (nrel->r_info), R_MN10300_NONE); /* Delete two bytes of data. */ if (!mn10300_elf_relax_delete_bytes (abfd, sec, irel->r_offset + 1, 2)) goto error_return; /* That will change things, so, we should relax again. Note that this is not required, and it may be slow. */ *again = TRUE; } /* Try to turn a 24 immediate, displacement or absolute address into a 8 immediate, displacement or absolute address. */ if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_24) { bfd_vma value = symval; value += irel->r_addend; /* See if the value will fit in 8 bits. */ if ((long) value < 0x7f && (long) value > -0x80) { unsigned char code; /* AM33 insns which have 24 operands are 6 bytes long and will have 0xfd as the first byte. */ /* Get the first opcode. */ code = bfd_get_8 (abfd, contents + irel->r_offset - 3); if (code == 0xfd) { /* Get the second opcode. */ code = bfd_get_8 (abfd, contents + irel->r_offset - 2); /* We can not relax 0x6b, 0x7b, 0x8b, 0x9b as no 24bit equivalent instructions exists. */ if (code != 0x6b && code != 0x7b && code != 0x8b && code != 0x9b && ((code & 0x0f) == 0x09 || (code & 0x0f) == 0x08 || (code & 0x0f) == 0x0a || (code & 0x0f) == 0x0b || (code & 0x0f) == 0x0e)) { /* Not safe if the high bit is on as relaxing may move the value out of high mem and thus not fit in a signed 8bit value. This is currently over conservative. */ if ((value & 0x80) == 0) { /* Note that we've changed the relocation contents, etc. */ elf_section_data (sec)->relocs = internal_relocs; elf_section_data (sec)->this_hdr.contents = contents; symtab_hdr->contents = (unsigned char *) isymbuf; /* Fix the opcode. */ bfd_put_8 (abfd, 0xfb, contents + irel->r_offset - 3); bfd_put_8 (abfd, code, contents + irel->r_offset - 2); /* Fix the relocation's type. */ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), R_MN10300_8); /* Delete two bytes of data. */ if (!mn10300_elf_relax_delete_bytes (abfd, sec, irel->r_offset + 1, 2)) goto error_return; /* That will change things, so, we should relax again. Note that this is not required, and it may be slow. */ *again = TRUE; break; } } } } } /* Try to turn a 32bit immediate, displacement or absolute address into a 16bit immediate, displacement or absolute address. */ if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_32 || ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOT32 || ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOTOFF32) { bfd_vma value = symval; if (ELF32_R_TYPE (irel->r_info) != (int) R_MN10300_32) { asection * sgot; sgot = bfd_get_section_by_name (elf_hash_table (link_info) ->dynobj, ".got"); if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOT32) { value = sgot->output_offset; if (h) value += h->root.got.offset; else value += (elf_local_got_offsets (abfd)[ELF32_R_SYM (irel->r_info)]); } else if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOTOFF32) value -= sgot->output_section->vma; else if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOTPC32) value = (sgot->output_section->vma - (sec->output_section->vma + sec->output_offset + irel->r_offset)); else abort (); } value += irel->r_addend; /* See if the value will fit in 24 bits. We allow any 16bit match here. We prune those we can't handle below. */ if ((long) value < 0x7fffff && (long) value > -0x800000) { unsigned char code; /* AM33 insns which have 32bit operands are 7 bytes long and will have 0xfe as the first byte. */ /* Get the first opcode. */ code = bfd_get_8 (abfd, contents + irel->r_offset - 3); if (code == 0xfe) { /* Get the second opcode. */ code = bfd_get_8 (abfd, contents + irel->r_offset - 2); /* All the am33 32 -> 24 relaxing possibilities. */ /* We can not relax 0x6b, 0x7b, 0x8b, 0x9b as no 24bit equivalent instructions exists. */ if (code != 0x6b && code != 0x7b && code != 0x8b && code != 0x9b && (ELF32_R_TYPE (irel->r_info) != (int) R_MN10300_GOTPC32) && ((code & 0x0f) == 0x09 || (code & 0x0f) == 0x08 || (code & 0x0f) == 0x0a || (code & 0x0f) == 0x0b || (code & 0x0f) == 0x0e)) { /* Not safe if the high bit is on as relaxing may move the value out of high mem and thus not fit in a signed 16bit value. This is currently over conservative. */ if ((value & 0x8000) == 0) { /* Note that we've changed the relocation contents, etc. */ elf_section_data (sec)->relocs = internal_relocs; elf_section_data (sec)->this_hdr.contents = contents; symtab_hdr->contents = (unsigned char *) isymbuf; /* Fix the opcode. */ bfd_put_8 (abfd, 0xfd, contents + irel->r_offset - 3); bfd_put_8 (abfd, code, contents + irel->r_offset - 2); /* Fix the relocation's type. */ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOTOFF32) ? R_MN10300_GOTOFF24 : (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOT32) ? R_MN10300_GOT24 : R_MN10300_24); /* Delete one byte of data. */ if (!mn10300_elf_relax_delete_bytes (abfd, sec, irel->r_offset + 3, 1)) goto error_return; /* That will change things, so, we should relax again. Note that this is not required, and it may be slow. */ *again = TRUE; break; } } } } /* See if the value will fit in 16 bits. We allow any 16bit match here. We prune those we can't handle below. */ if ((long) value < 0x7fff && (long) value > -0x8000) { unsigned char code; /* Most insns which have 32bit operands are 6 bytes long; exceptions are pcrel insns and bit insns. We handle pcrel insns above. We don't bother trying to handle the bit insns here. The first byte of the remaining insns will be 0xfc. */ /* Get the first opcode. */ code = bfd_get_8 (abfd, contents + irel->r_offset - 2); if (code != 0xfc) continue; /* Get the second opcode. */ code = bfd_get_8 (abfd, contents + irel->r_offset - 1); if ((code & 0xf0) < 0x80) switch (code & 0xf0) { /* mov (d32,am),dn -> mov (d32,am),dn mov dm,(d32,am) -> mov dn,(d32,am) mov (d32,am),an -> mov (d32,am),an mov dm,(d32,am) -> mov dn,(d32,am) movbu (d32,am),dn -> movbu (d32,am),dn movbu dm,(d32,am) -> movbu dn,(d32,am) movhu (d32,am),dn -> movhu (d32,am),dn movhu dm,(d32,am) -> movhu dn,(d32,am) */ case 0x00: case 0x10: case 0x20: case 0x30: case 0x40: case 0x50: case 0x60: case 0x70: /* Not safe if the high bit is on as relaxing may move the value out of high mem and thus not fit in a signed 16bit value. */ if (code == 0xcc && (value & 0x8000)) continue; /* Note that we've changed the relocation contents, etc. */ elf_section_data (sec)->relocs = internal_relocs; elf_section_data (sec)->this_hdr.contents = contents; symtab_hdr->contents = (unsigned char *) isymbuf; /* Fix the opcode. */ bfd_put_8 (abfd, 0xfa, contents + irel->r_offset - 2); bfd_put_8 (abfd, code, contents + irel->r_offset - 1); /* Fix the relocation's type. */ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOTOFF32) ? R_MN10300_GOTOFF16 : (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOT32) ? R_MN10300_GOT16 : (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOTPC32) ? R_MN10300_GOTPC16 : R_MN10300_16); /* Delete two bytes of data. */ if (!mn10300_elf_relax_delete_bytes (abfd, sec, irel->r_offset + 2, 2)) goto error_return; /* That will change things, so, we should relax again. Note that this is not required, and it may be slow. */ *again = TRUE; break; } else if ((code & 0xf0) == 0x80 || (code & 0xf0) == 0x90) switch (code & 0xf3) { /* mov dn,(abs32) -> mov dn,(abs16) movbu dn,(abs32) -> movbu dn,(abs16) movhu dn,(abs32) -> movhu dn,(abs16) */ case 0x81: case 0x82: case 0x83: /* Note that we've changed the relocation contents, etc. */ elf_section_data (sec)->relocs = internal_relocs; elf_section_data (sec)->this_hdr.contents = contents; symtab_hdr->contents = (unsigned char *) isymbuf; if ((code & 0xf3) == 0x81) code = 0x01 + (code & 0x0c); else if ((code & 0xf3) == 0x82) code = 0x02 + (code & 0x0c); else if ((code & 0xf3) == 0x83) code = 0x03 + (code & 0x0c); else abort (); /* Fix the opcode. */ bfd_put_8 (abfd, code, contents + irel->r_offset - 2); /* Fix the relocation's type. */ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOTOFF32) ? R_MN10300_GOTOFF16 : (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOT32) ? R_MN10300_GOT16 : (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOTPC32) ? R_MN10300_GOTPC16 : R_MN10300_16); /* The opcode got shorter too, so we have to fix the addend and offset too! */ irel->r_offset -= 1; /* Delete three bytes of data. */ if (!mn10300_elf_relax_delete_bytes (abfd, sec, irel->r_offset + 1, 3)) goto error_return; /* That will change things, so, we should relax again. Note that this is not required, and it may be slow. */ *again = TRUE; break; /* mov am,(abs32) -> mov am,(abs16) mov am,(d32,sp) -> mov am,(d16,sp) mov dm,(d32,sp) -> mov dm,(d32,sp) movbu dm,(d32,sp) -> movbu dm,(d32,sp) movhu dm,(d32,sp) -> movhu dm,(d32,sp) */ case 0x80: case 0x90: case 0x91: case 0x92: case 0x93: /* sp-based offsets are zero-extended. */ if (code >= 0x90 && code <= 0x93 && (long) value < 0) continue; /* Note that we've changed the relocation contents, etc. */ elf_section_data (sec)->relocs = internal_relocs; elf_section_data (sec)->this_hdr.contents = contents; symtab_hdr->contents = (unsigned char *) isymbuf; /* Fix the opcode. */ bfd_put_8 (abfd, 0xfa, contents + irel->r_offset - 2); bfd_put_8 (abfd, code, contents + irel->r_offset - 1); /* Fix the relocation's type. */ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOTOFF32) ? R_MN10300_GOTOFF16 : (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOT32) ? R_MN10300_GOT16 : (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOTPC32) ? R_MN10300_GOTPC16 : R_MN10300_16); /* Delete two bytes of data. */ if (!mn10300_elf_relax_delete_bytes (abfd, sec, irel->r_offset + 2, 2)) goto error_return; /* That will change things, so, we should relax again. Note that this is not required, and it may be slow. */ *again = TRUE; break; } else if ((code & 0xf0) < 0xf0) switch (code & 0xfc) { /* mov imm32,dn -> mov imm16,dn mov imm32,an -> mov imm16,an mov (abs32),dn -> mov (abs16),dn movbu (abs32),dn -> movbu (abs16),dn movhu (abs32),dn -> movhu (abs16),dn */ case 0xcc: case 0xdc: case 0xa4: case 0xa8: case 0xac: /* Not safe if the high bit is on as relaxing may move the value out of high mem and thus not fit in a signed 16bit value. */ if (code == 0xcc && (value & 0x8000)) continue; /* mov imm16, an zero-extends the immediate. */ if (code == 0xdc && (long) value < 0) continue; /* Note that we've changed the relocation contents, etc. */ elf_section_data (sec)->relocs = internal_relocs; elf_section_data (sec)->this_hdr.contents = contents; symtab_hdr->contents = (unsigned char *) isymbuf; if ((code & 0xfc) == 0xcc) code = 0x2c + (code & 0x03); else if ((code & 0xfc) == 0xdc) code = 0x24 + (code & 0x03); else if ((code & 0xfc) == 0xa4) code = 0x30 + (code & 0x03); else if ((code & 0xfc) == 0xa8) code = 0x34 + (code & 0x03); else if ((code & 0xfc) == 0xac) code = 0x38 + (code & 0x03); else abort (); /* Fix the opcode. */ bfd_put_8 (abfd, code, contents + irel->r_offset - 2); /* Fix the relocation's type. */ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOTOFF32) ? R_MN10300_GOTOFF16 : (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOT32) ? R_MN10300_GOT16 : (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOTPC32) ? R_MN10300_GOTPC16 : R_MN10300_16); /* The opcode got shorter too, so we have to fix the addend and offset too! */ irel->r_offset -= 1; /* Delete three bytes of data. */ if (!mn10300_elf_relax_delete_bytes (abfd, sec, irel->r_offset + 1, 3)) goto error_return; /* That will change things, so, we should relax again. Note that this is not required, and it may be slow. */ *again = TRUE; break; /* mov (abs32),an -> mov (abs16),an mov (d32,sp),an -> mov (d16,sp),an mov (d32,sp),dn -> mov (d16,sp),dn movbu (d32,sp),dn -> movbu (d16,sp),dn movhu (d32,sp),dn -> movhu (d16,sp),dn add imm32,dn -> add imm16,dn cmp imm32,dn -> cmp imm16,dn add imm32,an -> add imm16,an cmp imm32,an -> cmp imm16,an and imm32,dn -> and imm16,dn or imm32,dn -> or imm16,dn xor imm32,dn -> xor imm16,dn btst imm32,dn -> btst imm16,dn */ case 0xa0: case 0xb0: case 0xb1: case 0xb2: case 0xb3: case 0xc0: case 0xc8: case 0xd0: case 0xd8: case 0xe0: case 0xe1: case 0xe2: case 0xe3: /* cmp imm16, an zero-extends the immediate. */ if (code == 0xdc && (long) value < 0) continue; /* So do sp-based offsets. */ if (code >= 0xb0 && code <= 0xb3 && (long) value < 0) continue; /* Note that we've changed the relocation contents, etc. */ elf_section_data (sec)->relocs = internal_relocs; elf_section_data (sec)->this_hdr.contents = contents; symtab_hdr->contents = (unsigned char *) isymbuf; /* Fix the opcode. */ bfd_put_8 (abfd, 0xfa, contents + irel->r_offset - 2); bfd_put_8 (abfd, code, contents + irel->r_offset - 1); /* Fix the relocation's type. */ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOTOFF32) ? R_MN10300_GOTOFF16 : (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOT32) ? R_MN10300_GOT16 : (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOTPC32) ? R_MN10300_GOTPC16 : R_MN10300_16); /* Delete two bytes of data. */ if (!mn10300_elf_relax_delete_bytes (abfd, sec, irel->r_offset + 2, 2)) goto error_return; /* That will change things, so, we should relax again. Note that this is not required, and it may be slow. */ *again = TRUE; break; } else if (code == 0xfe) { /* add imm32,sp -> add imm16,sp */ /* Note that we've changed the relocation contents, etc. */ elf_section_data (sec)->relocs = internal_relocs; elf_section_data (sec)->this_hdr.contents = contents; symtab_hdr->contents = (unsigned char *) isymbuf; /* Fix the opcode. */ bfd_put_8 (abfd, 0xfa, contents + irel->r_offset - 2); bfd_put_8 (abfd, 0xfe, contents + irel->r_offset - 1); /* Fix the relocation's type. */ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOT32) ? R_MN10300_GOT16 : (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOTOFF32) ? R_MN10300_GOTOFF16 : (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOTPC32) ? R_MN10300_GOTPC16 : R_MN10300_16); /* Delete two bytes of data. */ if (!mn10300_elf_relax_delete_bytes (abfd, sec, irel->r_offset + 2, 2)) goto error_return; /* That will change things, so, we should relax again. Note that this is not required, and it may be slow. */ *again = TRUE; break; } } } } if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) { if (! link_info->keep_memory) free (isymbuf); else { /* Cache the symbols for elf_link_input_bfd. */ symtab_hdr->contents = (unsigned char *) isymbuf; } } if (contents != NULL && elf_section_data (sec)->this_hdr.contents != contents) { if (! link_info->keep_memory) free (contents); else { /* Cache the section contents for elf_link_input_bfd. */ elf_section_data (sec)->this_hdr.contents = contents; } } if (internal_relocs != NULL && elf_section_data (sec)->relocs != internal_relocs) free (internal_relocs); return TRUE; error_return: if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) free (isymbuf); if (contents != NULL && elf_section_data (section)->this_hdr.contents != contents) free (contents); if (internal_relocs != NULL && elf_section_data (section)->relocs != internal_relocs) free (internal_relocs); return FALSE; } /* This is a version of bfd_generic_get_relocated_section_contents which uses mn10300_elf_relocate_section. */ static bfd_byte * mn10300_elf_get_relocated_section_contents (bfd *output_bfd, struct bfd_link_info *link_info, struct bfd_link_order *link_order, bfd_byte *data, bfd_boolean relocatable, asymbol **symbols) { Elf_Internal_Shdr *symtab_hdr; asection *input_section = link_order->u.indirect.section; bfd *input_bfd = input_section->owner; asection **sections = NULL; Elf_Internal_Rela *internal_relocs = NULL; Elf_Internal_Sym *isymbuf = NULL; /* We only need to handle the case of relaxing, or of having a particular set of section contents, specially. */ if (relocatable || elf_section_data (input_section)->this_hdr.contents == NULL) return bfd_generic_get_relocated_section_contents (output_bfd, link_info, link_order, data, relocatable, symbols); symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; memcpy (data, elf_section_data (input_section)->this_hdr.contents, (size_t) input_section->size); if ((input_section->flags & SEC_RELOC) != 0 && input_section->reloc_count > 0) { asection **secpp; Elf_Internal_Sym *isym, *isymend; bfd_size_type amt; internal_relocs = _bfd_elf_link_read_relocs (input_bfd, input_section, NULL, NULL, FALSE); if (internal_relocs == NULL) goto error_return; if (symtab_hdr->sh_info != 0) { isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; if (isymbuf == NULL) isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, symtab_hdr->sh_info, 0, NULL, NULL, NULL); if (isymbuf == NULL) goto error_return; } amt = symtab_hdr->sh_info; amt *= sizeof (asection *); sections = bfd_malloc (amt); if (sections == NULL && amt != 0) goto error_return; isymend = isymbuf + symtab_hdr->sh_info; for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp) { asection *isec; if (isym->st_shndx == SHN_UNDEF) isec = bfd_und_section_ptr; else if (isym->st_shndx == SHN_ABS) isec = bfd_abs_section_ptr; else if (isym->st_shndx == SHN_COMMON) isec = bfd_com_section_ptr; else isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx); *secpp = isec; } if (! mn10300_elf_relocate_section (output_bfd, link_info, input_bfd, input_section, data, internal_relocs, isymbuf, sections)) goto error_return; if (sections != NULL) free (sections); if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) free (isymbuf); if (internal_relocs != elf_section_data (input_section)->relocs) free (internal_relocs); } return data; error_return: if (sections != NULL) free (sections); if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) free (isymbuf); if (internal_relocs != NULL && internal_relocs != elf_section_data (input_section)->relocs) free (internal_relocs); return NULL; } /* Assorted hash table functions. */ /* Initialize an entry in the link hash table. */ /* Create an entry in an MN10300 ELF linker hash table. */ static struct bfd_hash_entry * elf32_mn10300_link_hash_newfunc (struct bfd_hash_entry *entry, struct bfd_hash_table *table, const char *string) { struct elf32_mn10300_link_hash_entry *ret = (struct elf32_mn10300_link_hash_entry *) entry; /* Allocate the structure if it has not already been allocated by a subclass. */ if (ret == NULL) ret = (struct elf32_mn10300_link_hash_entry *) bfd_hash_allocate (table, sizeof (* ret)); if (ret == NULL) return (struct bfd_hash_entry *) ret; /* Call the allocation method of the superclass. */ ret = (struct elf32_mn10300_link_hash_entry *) _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, table, string); if (ret != NULL) { ret->direct_calls = 0; ret->stack_size = 0; ret->movm_args = 0; ret->movm_stack_size = 0; ret->flags = 0; ret->value = 0; } return (struct bfd_hash_entry *) ret; } /* Create an mn10300 ELF linker hash table. */ static struct bfd_link_hash_table * elf32_mn10300_link_hash_table_create (bfd *abfd) { struct elf32_mn10300_link_hash_table *ret; bfd_size_type amt = sizeof (* ret); ret = bfd_malloc (amt); if (ret == NULL) return NULL; if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, elf32_mn10300_link_hash_newfunc, sizeof (struct elf32_mn10300_link_hash_entry), MN10300_ELF_DATA)) { free (ret); return NULL; } ret->flags = 0; amt = sizeof (struct elf_link_hash_table); ret->static_hash_table = bfd_malloc (amt); if (ret->static_hash_table == NULL) { free (ret); return NULL; } if (!_bfd_elf_link_hash_table_init (&ret->static_hash_table->root, abfd, elf32_mn10300_link_hash_newfunc, sizeof (struct elf32_mn10300_link_hash_entry), MN10300_ELF_DATA)) { free (ret->static_hash_table); free (ret); return NULL; } return & ret->root.root; } /* Free an mn10300 ELF linker hash table. */ static void elf32_mn10300_link_hash_table_free (struct bfd_link_hash_table *hash) { struct elf32_mn10300_link_hash_table *ret = (struct elf32_mn10300_link_hash_table *) hash; _bfd_generic_link_hash_table_free ((struct bfd_link_hash_table *) ret->static_hash_table); _bfd_generic_link_hash_table_free ((struct bfd_link_hash_table *) ret); } static unsigned long elf_mn10300_mach (flagword flags) { switch (flags & EF_MN10300_MACH) { case E_MN10300_MACH_MN10300: default: return bfd_mach_mn10300; case E_MN10300_MACH_AM33: return bfd_mach_am33; case E_MN10300_MACH_AM33_2: return bfd_mach_am33_2; } } /* The final processing done just before writing out a MN10300 ELF object file. This gets the MN10300 architecture right based on the machine number. */ static void _bfd_mn10300_elf_final_write_processing (bfd *abfd, bfd_boolean linker ATTRIBUTE_UNUSED) { unsigned long val; switch (bfd_get_mach (abfd)) { default: case bfd_mach_mn10300: val = E_MN10300_MACH_MN10300; break; case bfd_mach_am33: val = E_MN10300_MACH_AM33; break; case bfd_mach_am33_2: val = E_MN10300_MACH_AM33_2; break; } elf_elfheader (abfd)->e_flags &= ~ (EF_MN10300_MACH); elf_elfheader (abfd)->e_flags |= val; } static bfd_boolean _bfd_mn10300_elf_object_p (bfd *abfd) { bfd_default_set_arch_mach (abfd, bfd_arch_mn10300, elf_mn10300_mach (elf_elfheader (abfd)->e_flags)); return TRUE; } /* Merge backend specific data from an object file to the output object file when linking. */ static bfd_boolean _bfd_mn10300_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd) { if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour || bfd_get_flavour (obfd) != bfd_target_elf_flavour) return TRUE; if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) && bfd_get_mach (obfd) < bfd_get_mach (ibfd)) { if (! bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd))) return FALSE; } return TRUE; } #define PLT0_ENTRY_SIZE 15 #define PLT_ENTRY_SIZE 20 #define PIC_PLT_ENTRY_SIZE 24 static const bfd_byte elf_mn10300_plt0_entry[PLT0_ENTRY_SIZE] = { 0xfc, 0xa0, 0, 0, 0, 0, /* mov (.got+8),a0 */ 0xfe, 0xe, 0x10, 0, 0, 0, 0, /* mov (.got+4),r1 */ 0xf0, 0xf4, /* jmp (a0) */ }; static const bfd_byte elf_mn10300_plt_entry[PLT_ENTRY_SIZE] = { 0xfc, 0xa0, 0, 0, 0, 0, /* mov (nameN@GOT + .got),a0 */ 0xf0, 0xf4, /* jmp (a0) */ 0xfe, 8, 0, 0, 0, 0, 0, /* mov reloc-table-address,r0 */ 0xdc, 0, 0, 0, 0, /* jmp .plt0 */ }; static const bfd_byte elf_mn10300_pic_plt_entry[PIC_PLT_ENTRY_SIZE] = { 0xfc, 0x22, 0, 0, 0, 0, /* mov (nameN@GOT,a2),a0 */ 0xf0, 0xf4, /* jmp (a0) */ 0xfe, 8, 0, 0, 0, 0, 0, /* mov reloc-table-address,r0 */ 0xf8, 0x22, 8, /* mov (8,a2),a0 */ 0xfb, 0xa, 0x1a, 4, /* mov (4,a2),r1 */ 0xf0, 0xf4, /* jmp (a0) */ }; /* Return size of the first PLT entry. */ #define elf_mn10300_sizeof_plt0(info) \ (info->shared ? PIC_PLT_ENTRY_SIZE : PLT0_ENTRY_SIZE) /* Return size of a PLT entry. */ #define elf_mn10300_sizeof_plt(info) \ (info->shared ? PIC_PLT_ENTRY_SIZE : PLT_ENTRY_SIZE) /* Return offset of the PLT0 address in an absolute PLT entry. */ #define elf_mn10300_plt_plt0_offset(info) 16 /* Return offset of the linker in PLT0 entry. */ #define elf_mn10300_plt0_linker_offset(info) 2 /* Return offset of the GOT id in PLT0 entry. */ #define elf_mn10300_plt0_gotid_offset(info) 9 /* Return offset of the temporary in PLT entry. */ #define elf_mn10300_plt_temp_offset(info) 8 /* Return offset of the symbol in PLT entry. */ #define elf_mn10300_plt_symbol_offset(info) 2 /* Return offset of the relocation in PLT entry. */ #define elf_mn10300_plt_reloc_offset(info) 11 /* The name of the dynamic interpreter. This is put in the .interp section. */ #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1" /* Create dynamic sections when linking against a dynamic object. */ static bfd_boolean _bfd_mn10300_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info) { flagword flags; asection * s; const struct elf_backend_data * bed = get_elf_backend_data (abfd); int ptralign = 0; switch (bed->s->arch_size) { case 32: ptralign = 2; break; case 64: ptralign = 3; break; default: bfd_set_error (bfd_error_bad_value); return FALSE; } /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and .rel[a].bss sections. */ flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED); s = bfd_make_section_with_flags (abfd, (bed->default_use_rela_p ? ".rela.plt" : ".rel.plt"), flags | SEC_READONLY); if (s == NULL || ! bfd_set_section_alignment (abfd, s, ptralign)) return FALSE; if (! _bfd_mn10300_elf_create_got_section (abfd, info)) return FALSE; { const char * secname; char * relname; flagword secflags; asection * sec; for (sec = abfd->sections; sec; sec = sec->next) { secflags = bfd_get_section_flags (abfd, sec); if ((secflags & (SEC_DATA | SEC_LINKER_CREATED)) || ((secflags & SEC_HAS_CONTENTS) != SEC_HAS_CONTENTS)) continue; secname = bfd_get_section_name (abfd, sec); relname = bfd_malloc (strlen (secname) + 6); strcpy (relname, ".rela"); strcat (relname, secname); s = bfd_make_section_with_flags (abfd, relname, flags | SEC_READONLY); if (s == NULL || ! bfd_set_section_alignment (abfd, s, ptralign)) return FALSE; } } if (bed->want_dynbss) { /* The .dynbss section is a place to put symbols which are defined by dynamic objects, are referenced by regular objects, and are not functions. We must allocate space for them in the process image and use a R_*_COPY reloc to tell the dynamic linker to initialize them at run time. The linker script puts the .dynbss section into the .bss section of the final image. */ s = bfd_make_section_with_flags (abfd, ".dynbss", SEC_ALLOC | SEC_LINKER_CREATED); if (s == NULL) return FALSE; /* The .rel[a].bss section holds copy relocs. This section is not normally needed. We need to create it here, though, so that the linker will map it to an output section. We can't just create it only if we need it, because we will not know whether we need it until we have seen all the input files, and the first time the main linker code calls BFD after examining all the input files (size_dynamic_sections) the input sections have already been mapped to the output sections. If the section turns out not to be needed, we can discard it later. We will never need this section when generating a shared object, since they do not use copy relocs. */ if (! info->shared) { s = bfd_make_section_with_flags (abfd, (bed->default_use_rela_p ? ".rela.bss" : ".rel.bss"), flags | SEC_READONLY); if (s == NULL || ! bfd_set_section_alignment (abfd, s, ptralign)) return FALSE; } } return TRUE; } /* Adjust a symbol defined by a dynamic object and referenced by a regular object. The current definition is in some section of the dynamic object, but we're not including those sections. We have to change the definition to something the rest of the link can understand. */ static bfd_boolean _bfd_mn10300_elf_adjust_dynamic_symbol (struct bfd_link_info * info, struct elf_link_hash_entry * h) { bfd * dynobj; asection * s; dynobj = elf_hash_table (info)->dynobj; /* Make sure we know what is going on here. */ BFD_ASSERT (dynobj != NULL && (h->needs_plt || h->u.weakdef != NULL || (h->def_dynamic && h->ref_regular && !h->def_regular))); /* If this is a function, put it in the procedure linkage table. We will fill in the contents of the procedure linkage table later, when we know the address of the .got section. */ if (h->type == STT_FUNC || h->needs_plt) { if (! info->shared && !h->def_dynamic && !h->ref_dynamic) { /* This case can occur if we saw a PLT reloc in an input file, but the symbol was never referred to by a dynamic object. In such a case, we don't actually need to build a procedure linkage table, and we can just do a REL32 reloc instead. */ BFD_ASSERT (h->needs_plt); return TRUE; } /* Make sure this symbol is output as a dynamic symbol. */ if (h->dynindx == -1) { if (! bfd_elf_link_record_dynamic_symbol (info, h)) return FALSE; } s = bfd_get_section_by_name (dynobj, ".plt"); BFD_ASSERT (s != NULL); /* If this is the first .plt entry, make room for the special first entry. */ if (s->size == 0) s->size += elf_mn10300_sizeof_plt0 (info); /* If this symbol is not defined in a regular file, and we are not generating a shared library, then set the symbol to this location in the .plt. This is required to make function pointers compare as equal between the normal executable and the shared library. */ if (! info->shared && !h->def_regular) { h->root.u.def.section = s; h->root.u.def.value = s->size; } h->plt.offset = s->size; /* Make room for this entry. */ s->size += elf_mn10300_sizeof_plt (info); /* We also need to make an entry in the .got.plt section, which will be placed in the .got section by the linker script. */ s = bfd_get_section_by_name (dynobj, ".got.plt"); BFD_ASSERT (s != NULL); s->size += 4; /* We also need to make an entry in the .rela.plt section. */ s = bfd_get_section_by_name (dynobj, ".rela.plt"); BFD_ASSERT (s != NULL); s->size += sizeof (Elf32_External_Rela); return TRUE; } /* If this is a weak symbol, and there is a real definition, the processor independent code will have arranged for us to see the real definition first, and we can just use the same value. */ if (h->u.weakdef != NULL) { BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined || h->u.weakdef->root.type == bfd_link_hash_defweak); h->root.u.def.section = h->u.weakdef->root.u.def.section; h->root.u.def.value = h->u.weakdef->root.u.def.value; return TRUE; } /* This is a reference to a symbol defined by a dynamic object which is not a function. */ /* If we are creating a shared library, we must presume that the only references to the symbol are via the global offset table. For such cases we need not do anything here; the relocations will be handled correctly by relocate_section. */ if (info->shared) return TRUE; /* If there are no references to this symbol that do not use the GOT, we don't need to generate a copy reloc. */ if (!h->non_got_ref) return TRUE; if (h->size == 0) { (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), h->root.root.string); return TRUE; } /* We must allocate the symbol in our .dynbss section, which will become part of the .bss section of the executable. There will be an entry for this symbol in the .dynsym section. The dynamic object will contain position independent code, so all references from the dynamic object to this symbol will go through the global offset table. The dynamic linker will use the .dynsym entry to determine the address it must put in the global offset table, so both the dynamic object and the regular object will refer to the same memory location for the variable. */ s = bfd_get_section_by_name (dynobj, ".dynbss"); BFD_ASSERT (s != NULL); /* We must generate a R_MN10300_COPY reloc to tell the dynamic linker to copy the initial value out of the dynamic object and into the runtime process image. We need to remember the offset into the .rela.bss section we are going to use. */ if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) { asection * srel; srel = bfd_get_section_by_name (dynobj, ".rela.bss"); BFD_ASSERT (srel != NULL); srel->size += sizeof (Elf32_External_Rela); h->needs_copy = 1; } return _bfd_elf_adjust_dynamic_copy (h, s); } /* Set the sizes of the dynamic sections. */ static bfd_boolean _bfd_mn10300_elf_size_dynamic_sections (bfd * output_bfd, struct bfd_link_info * info) { bfd * dynobj; asection * s; bfd_boolean plt; bfd_boolean relocs; bfd_boolean reltext; dynobj = elf_hash_table (info)->dynobj; BFD_ASSERT (dynobj != NULL); if (elf_hash_table (info)->dynamic_sections_created) { /* Set the contents of the .interp section to the interpreter. */ if (info->executable) { s = bfd_get_section_by_name (dynobj, ".interp"); BFD_ASSERT (s != NULL); s->size = sizeof ELF_DYNAMIC_INTERPRETER; s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; } } else { /* We may have created entries in the .rela.got section. However, if we are not creating the dynamic sections, we will not actually use these entries. Reset the size of .rela.got, which will cause it to get stripped from the output file below. */ s = bfd_get_section_by_name (dynobj, ".rela.got"); if (s != NULL) s->size = 0; } /* The check_relocs and adjust_dynamic_symbol entry points have determined the sizes of the various dynamic sections. Allocate memory for them. */ plt = FALSE; relocs = FALSE; reltext = FALSE; for (s = dynobj->sections; s != NULL; s = s->next) { const char * name; if ((s->flags & SEC_LINKER_CREATED) == 0) continue; /* It's OK to base decisions on the section name, because none of the dynobj section names depend upon the input files. */ name = bfd_get_section_name (dynobj, s); if (streq (name, ".plt")) { /* Remember whether there is a PLT. */ plt = s->size != 0; } else if (CONST_STRNEQ (name, ".rela")) { if (s->size != 0) { asection * target; /* Remember whether there are any reloc sections other than .rela.plt. */ if (! streq (name, ".rela.plt")) { const char * outname; relocs = TRUE; /* If this relocation section applies to a read only section, then we probably need a DT_TEXTREL entry. The entries in the .rela.plt section really apply to the .got section, which we created ourselves and so know is not readonly. */ outname = bfd_get_section_name (output_bfd, s->output_section); target = bfd_get_section_by_name (output_bfd, outname + 5); if (target != NULL && (target->flags & SEC_READONLY) != 0 && (target->flags & SEC_ALLOC) != 0) reltext = TRUE; } /* We use the reloc_count field as a counter if we need to copy relocs into the output file. */ s->reloc_count = 0; } } else if (! CONST_STRNEQ (name, ".got") && ! streq (name, ".dynbss")) /* It's not one of our sections, so don't allocate space. */ continue; if (s->size == 0) { /* If we don't need this section, strip it from the output file. This is mostly to handle .rela.bss and .rela.plt. We must create both sections in create_dynamic_sections, because they must be created before the linker maps input sections to output sections. The linker does that before adjust_dynamic_symbol is called, and it is that function which decides whether anything needs to go into these sections. */ s->flags |= SEC_EXCLUDE; continue; } if ((s->flags & SEC_HAS_CONTENTS) == 0) continue; /* Allocate memory for the section contents. We use bfd_zalloc here in case unused entries are not reclaimed before the section's contents are written out. This should not happen, but this way if it does, we get a R_MN10300_NONE reloc instead of garbage. */ s->contents = bfd_zalloc (dynobj, s->size); if (s->contents == NULL) return FALSE; } if (elf_hash_table (info)->dynamic_sections_created) { /* Add some entries to the .dynamic section. We fill in the values later, in _bfd_mn10300_elf_finish_dynamic_sections, but we must add the entries now so that we get the correct size for the .dynamic section. The DT_DEBUG entry is filled in by the dynamic linker and used by the debugger. */ if (! info->shared) { if (!_bfd_elf_add_dynamic_entry (info, DT_DEBUG, 0)) return FALSE; } if (plt) { if (!_bfd_elf_add_dynamic_entry (info, DT_PLTGOT, 0) || !_bfd_elf_add_dynamic_entry (info, DT_PLTRELSZ, 0) || !_bfd_elf_add_dynamic_entry (info, DT_PLTREL, DT_RELA) || !_bfd_elf_add_dynamic_entry (info, DT_JMPREL, 0)) return FALSE; } if (relocs) { if (!_bfd_elf_add_dynamic_entry (info, DT_RELA, 0) || !_bfd_elf_add_dynamic_entry (info, DT_RELASZ, 0) || !_bfd_elf_add_dynamic_entry (info, DT_RELAENT, sizeof (Elf32_External_Rela))) return FALSE; } if (reltext) { if (!_bfd_elf_add_dynamic_entry (info, DT_TEXTREL, 0)) return FALSE; } } return TRUE; } /* Finish up dynamic symbol handling. We set the contents of various dynamic sections here. */ static bfd_boolean _bfd_mn10300_elf_finish_dynamic_symbol (bfd * output_bfd, struct bfd_link_info * info, struct elf_link_hash_entry * h, Elf_Internal_Sym * sym) { bfd * dynobj; dynobj = elf_hash_table (info)->dynobj; if (h->plt.offset != (bfd_vma) -1) { asection * splt; asection * sgot; asection * srel; bfd_vma plt_index; bfd_vma got_offset; Elf_Internal_Rela rel; /* This symbol has an entry in the procedure linkage table. Set it up. */ BFD_ASSERT (h->dynindx != -1); splt = bfd_get_section_by_name (dynobj, ".plt"); sgot = bfd_get_section_by_name (dynobj, ".got.plt"); srel = bfd_get_section_by_name (dynobj, ".rela.plt"); BFD_ASSERT (splt != NULL && sgot != NULL && srel != NULL); /* Get the index in the procedure linkage table which corresponds to this symbol. This is the index of this symbol in all the symbols for which we are making plt entries. The first entry in the procedure linkage table is reserved. */ plt_index = ((h->plt.offset - elf_mn10300_sizeof_plt0 (info)) / elf_mn10300_sizeof_plt (info)); /* Get the offset into the .got table of the entry that corresponds to this function. Each .got entry is 4 bytes. The first three are reserved. */ got_offset = (plt_index + 3) * 4; /* Fill in the entry in the procedure linkage table. */ if (! info->shared) { memcpy (splt->contents + h->plt.offset, elf_mn10300_plt_entry, elf_mn10300_sizeof_plt (info)); bfd_put_32 (output_bfd, (sgot->output_section->vma + sgot->output_offset + got_offset), (splt->contents + h->plt.offset + elf_mn10300_plt_symbol_offset (info))); bfd_put_32 (output_bfd, (1 - h->plt.offset - elf_mn10300_plt_plt0_offset (info)), (splt->contents + h->plt.offset + elf_mn10300_plt_plt0_offset (info))); } else { memcpy (splt->contents + h->plt.offset, elf_mn10300_pic_plt_entry, elf_mn10300_sizeof_plt (info)); bfd_put_32 (output_bfd, got_offset, (splt->contents + h->plt.offset + elf_mn10300_plt_symbol_offset (info))); } bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), (splt->contents + h->plt.offset + elf_mn10300_plt_reloc_offset (info))); /* Fill in the entry in the global offset table. */ bfd_put_32 (output_bfd, (splt->output_section->vma + splt->output_offset + h->plt.offset + elf_mn10300_plt_temp_offset (info)), sgot->contents + got_offset); /* Fill in the entry in the .rela.plt section. */ rel.r_offset = (sgot->output_section->vma + sgot->output_offset + got_offset); rel.r_info = ELF32_R_INFO (h->dynindx, R_MN10300_JMP_SLOT); rel.r_addend = 0; bfd_elf32_swap_reloca_out (output_bfd, &rel, (bfd_byte *) ((Elf32_External_Rela *) srel->contents + plt_index)); if (!h->def_regular) /* Mark the symbol as undefined, rather than as defined in the .plt section. Leave the value alone. */ sym->st_shndx = SHN_UNDEF; } if (h->got.offset != (bfd_vma) -1) { asection * sgot; asection * srel; Elf_Internal_Rela rel; /* This symbol has an entry in the global offset table. Set it up. */ sgot = bfd_get_section_by_name (dynobj, ".got"); srel = bfd_get_section_by_name (dynobj, ".rela.got"); BFD_ASSERT (sgot != NULL && srel != NULL); rel.r_offset = (sgot->output_section->vma + sgot->output_offset + (h->got.offset & ~1)); /* If this is a -Bsymbolic link, and the symbol is defined locally, we just want to emit a RELATIVE reloc. Likewise if the symbol was forced to be local because of a version file. The entry in the global offset table will already have been initialized in the relocate_section function. */ if (info->shared && (info->symbolic || h->dynindx == -1) && h->def_regular) { rel.r_info = ELF32_R_INFO (0, R_MN10300_RELATIVE); rel.r_addend = (h->root.u.def.value + h->root.u.def.section->output_section->vma + h->root.u.def.section->output_offset); } else { bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset); rel.r_info = ELF32_R_INFO (h->dynindx, R_MN10300_GLOB_DAT); rel.r_addend = 0; } bfd_elf32_swap_reloca_out (output_bfd, &rel, (bfd_byte *) ((Elf32_External_Rela *) srel->contents + srel->reloc_count)); ++ srel->reloc_count; } if (h->needs_copy) { asection * s; Elf_Internal_Rela rel; /* This symbol needs a copy reloc. Set it up. */ BFD_ASSERT (h->dynindx != -1 && (h->root.type == bfd_link_hash_defined || h->root.type == bfd_link_hash_defweak)); s = bfd_get_section_by_name (h->root.u.def.section->owner, ".rela.bss"); BFD_ASSERT (s != NULL); rel.r_offset = (h->root.u.def.value + h->root.u.def.section->output_section->vma + h->root.u.def.section->output_offset); rel.r_info = ELF32_R_INFO (h->dynindx, R_MN10300_COPY); rel.r_addend = 0; bfd_elf32_swap_reloca_out (output_bfd, & rel, (bfd_byte *) ((Elf32_External_Rela *) s->contents + s->reloc_count)); ++ s->reloc_count; } /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ if (streq (h->root.root.string, "_DYNAMIC") || h == elf_hash_table (info)->hgot) sym->st_shndx = SHN_ABS; return TRUE; } /* Finish up the dynamic sections. */ static bfd_boolean _bfd_mn10300_elf_finish_dynamic_sections (bfd * output_bfd, struct bfd_link_info * info) { bfd * dynobj; asection * sgot; asection * sdyn; dynobj = elf_hash_table (info)->dynobj; sgot = bfd_get_section_by_name (dynobj, ".got.plt"); BFD_ASSERT (sgot != NULL); sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); if (elf_hash_table (info)->dynamic_sections_created) { asection * splt; Elf32_External_Dyn * dyncon; Elf32_External_Dyn * dynconend; BFD_ASSERT (sdyn != NULL); dyncon = (Elf32_External_Dyn *) sdyn->contents; dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); for (; dyncon < dynconend; dyncon++) { Elf_Internal_Dyn dyn; const char * name; asection * s; bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); switch (dyn.d_tag) { default: break; case DT_PLTGOT: name = ".got"; goto get_vma; case DT_JMPREL: name = ".rela.plt"; get_vma: s = bfd_get_section_by_name (output_bfd, name); BFD_ASSERT (s != NULL); dyn.d_un.d_ptr = s->vma; bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); break; case DT_PLTRELSZ: s = bfd_get_section_by_name (output_bfd, ".rela.plt"); BFD_ASSERT (s != NULL); dyn.d_un.d_val = s->size; bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); break; case DT_RELASZ: /* My reading of the SVR4 ABI indicates that the procedure linkage table relocs (DT_JMPREL) should be included in the overall relocs (DT_RELA). This is what Solaris does. However, UnixWare can not handle that case. Therefore, we override the DT_RELASZ entry here to make it not include the JMPREL relocs. Since the linker script arranges for .rela.plt to follow all other relocation sections, we don't have to worry about changing the DT_RELA entry. */ s = bfd_get_section_by_name (output_bfd, ".rela.plt"); if (s != NULL) dyn.d_un.d_val -= s->size; bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); break; } } /* Fill in the first entry in the procedure linkage table. */ splt = bfd_get_section_by_name (dynobj, ".plt"); if (splt && splt->size > 0) { if (info->shared) { memcpy (splt->contents, elf_mn10300_pic_plt_entry, elf_mn10300_sizeof_plt (info)); } else { memcpy (splt->contents, elf_mn10300_plt0_entry, PLT0_ENTRY_SIZE); bfd_put_32 (output_bfd, sgot->output_section->vma + sgot->output_offset + 4, splt->contents + elf_mn10300_plt0_gotid_offset (info)); bfd_put_32 (output_bfd, sgot->output_section->vma + sgot->output_offset + 8, splt->contents + elf_mn10300_plt0_linker_offset (info)); } /* UnixWare sets the entsize of .plt to 4, although that doesn't really seem like the right value. */ elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4; } } /* Fill in the first three entries in the global offset table. */ if (sgot->size > 0) { if (sdyn == NULL) bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); else bfd_put_32 (output_bfd, sdyn->output_section->vma + sdyn->output_offset, sgot->contents); bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); } elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; return TRUE; } /* Classify relocation types, such that combreloc can sort them properly. */ static enum elf_reloc_type_class _bfd_mn10300_elf_reloc_type_class (const Elf_Internal_Rela *rela) { switch ((int) ELF32_R_TYPE (rela->r_info)) { case R_MN10300_RELATIVE: return reloc_class_relative; case R_MN10300_JMP_SLOT: return reloc_class_plt; case R_MN10300_COPY: return reloc_class_copy; default: return reloc_class_normal; } } #ifndef ELF_ARCH #define TARGET_LITTLE_SYM bfd_elf32_mn10300_vec #define TARGET_LITTLE_NAME "elf32-mn10300" #define ELF_ARCH bfd_arch_mn10300 #define ELF_MACHINE_CODE EM_MN10300 #define ELF_MACHINE_ALT1 EM_CYGNUS_MN10300 #define ELF_MAXPAGESIZE 0x1000 #endif #define elf_info_to_howto mn10300_info_to_howto #define elf_info_to_howto_rel 0 #define elf_backend_can_gc_sections 1 #define elf_backend_rela_normal 1 #define elf_backend_check_relocs mn10300_elf_check_relocs #define elf_backend_gc_mark_hook mn10300_elf_gc_mark_hook #define elf_backend_relocate_section mn10300_elf_relocate_section #define bfd_elf32_bfd_relax_section mn10300_elf_relax_section #define bfd_elf32_bfd_get_relocated_section_contents \ mn10300_elf_get_relocated_section_contents #define bfd_elf32_bfd_link_hash_table_create \ elf32_mn10300_link_hash_table_create #define bfd_elf32_bfd_link_hash_table_free \ elf32_mn10300_link_hash_table_free #ifndef elf_symbol_leading_char #define elf_symbol_leading_char '_' #endif /* So we can set bits in e_flags. */ #define elf_backend_final_write_processing \ _bfd_mn10300_elf_final_write_processing #define elf_backend_object_p _bfd_mn10300_elf_object_p #define bfd_elf32_bfd_merge_private_bfd_data \ _bfd_mn10300_elf_merge_private_bfd_data #define elf_backend_can_gc_sections 1 #define elf_backend_create_dynamic_sections \ _bfd_mn10300_elf_create_dynamic_sections #define elf_backend_adjust_dynamic_symbol \ _bfd_mn10300_elf_adjust_dynamic_symbol #define elf_backend_size_dynamic_sections \ _bfd_mn10300_elf_size_dynamic_sections #define elf_backend_omit_section_dynsym \ ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) #define elf_backend_finish_dynamic_symbol \ _bfd_mn10300_elf_finish_dynamic_symbol #define elf_backend_finish_dynamic_sections \ _bfd_mn10300_elf_finish_dynamic_sections #define elf_backend_reloc_type_class \ _bfd_mn10300_elf_reloc_type_class #define elf_backend_want_got_plt 1 #define elf_backend_plt_readonly 1 #define elf_backend_want_plt_sym 0 #define elf_backend_got_header_size 12 #include "elf32-target.h"
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